The On-Line Encyclopedia of Integer Sequences (OEIS)

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A192995

Number of n X n symmetric 0..1 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..1 introduced in lower triangular row major order
(history; published version)

#7 by Charles R Greathouse IV at Fri Dec 18 18:17:41 EST 2015

NAME

Number of nXn n X n symmetric 0..1 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..1 introduced in lower triangular row major order

Discussion

Fri Dec 18

18:17

OEIS Server: https://oeis.org/edit/global/2478

#6 by Russ Cox at Sat Mar 31 12:36:20 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Jul 14 2011

Discussion

Sat Mar 31

12:36

OEIS Server: https://oeis.org/edit/global/875

#5 by Ron Hardin at Thu Jul 14 07:29:00 EDT 2011

STATUS

editing

approved

#4 by Ron Hardin at Thu Jul 14 07:28:56 EDT 2011

LINKS

R. H. Hardin, <a href="/A192995/b192995.txt">Table of n, a(n) for n = 1..19</a>

#3 by Ron Hardin at Thu Jul 14 07:28:18 EDT 2011

NAME

allocated for Ron HardinNumber of nXn symmetric 0..1 arrays with each element equal to at least two horizontal or vertical neighbors and with new values 0..1 introduced in lower triangular row major order

DATA

0, 1, 1, 5, 24, 184, 2052, 34481, 852317, 31436448, 1719054683, 139749375352, 16887682211105, 3032513808121101, 809442991768500676, 321179427812462958357, 189437827654558885755438

OFFSET

1,4

EXAMPLE

Some solutions for 8X8 containing a 1

..0..0..0..0..0..0..0..0....0..0..0..0..1..1..0..0....0..0..0..0..0..0..0..0

..0..0..1..1..0..0..0..0....0..1..1..0..1..1..0..0....0..1..1..1..1..1..0..0

..0..1..1..1..0..0..1..1....0..1..1..0..1..1..1..0....0..1..1..1..1..1..0..0

..0..1..1..1..1..0..1..1....0..0..0..0..0..1..1..0....0..1..1..1..0..0..0..0

..0..0..0..1..1..0..1..1....1..1..1..0..0..1..1..0....0..1..1..0..0..1..1..0

..0..0..0..0..0..0..0..1....1..1..1..1..1..1..0..0....0..1..1..0..1..1..1..0

..0..0..1..1..1..0..0..1....0..0..1..1..1..0..0..0....0..0..0..0..1..1..1..0

..0..0..1..1..1..1..1..1....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Jul 14 2011

STATUS

approved

editing

#2 by Ron Hardin at Thu Jul 14 07:26:47 EDT 2011

KEYWORD

allocating

allocated

#1 by Ron Hardin at Thu Jul 14 07:26:47 EDT 2011

NAME

allocated for Ron Hardin

KEYWORD

allocating

STATUS

approved