The On-Line Encyclopedia of Integer Sequences (OEIS)

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A202798

Number of nX4 binary arrays with every one adjacent to another one horizontally or vertically
(history; published version)

#5 by Russ Cox at Sat Mar 31 12:36:52 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Dec 24 2011

Discussion

Sat Mar 31

12:36

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

#4 by Ron Hardin at Sat Dec 24 13:06:37 EST 2011

STATUS

editing

approved

#3 by Ron Hardin at Sat Dec 24 13:06:34 EST 2011

LINKS

R. H. Hardin, <a href="/A202798/b202798.txt">Table of n, a(n) for n = 1..210</a>

#2 by Ron Hardin at Sat Dec 24 13:06:13 EST 2011

NAME

allocated for Ron HardinNumber of nX4 binary arrays with every one adjacent to another one horizontally or vertically

DATA

7, 126, 1718, 22946, 311144, 4217066, 57127796, 773948962, 10485233258, 142050385280, 1924452482144, 26071860295098, 353213105139604, 4785216541174944, 64828561353680056, 878276318748587482

OFFSET

1,1

COMMENTS

Column 4 of A202802

FORMULA

Empirical: a(n) = 13*a(n-1) -7*a(n-2) +181*a(n-3) +123*a(n-4) +940*a(n-5) +545*a(n-6) -2084*a(n-7) -1964*a(n-8) +1512*a(n-9) +1984*a(n-10) -512*a(n-11) -1024*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Dec 24 2011

STATUS

approved

editing

#1 by Ron Hardin at Sat Dec 24 13:02:22 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved