The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A187405 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A187405

Number of (n+1)X(n+1) 0..5 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum
(history; published version)

#4 by Russ Cox at Sat Mar 31 12:36:08 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ Mar 09 2011

Discussion

Sat Mar 31

12:36

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

#3 by Ron Hardin at Wed Mar 09 13:02:33 EST 2011

STATUS

proposed

approved

#2 by Ron Hardin at Wed Mar 09 13:02:29 EST 2011

NAME

allocated for Ron HardinNumber of (n+1)X(n+1) 0..5 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum

DATA

36, 4332, 2164680, 4935992256, 54448184779776, 3028538328016591872

OFFSET

1,1

COMMENTS

Column 5 of A187408

EXAMPLE

Some solutions for 4X4

..0..3..0..3....0..3..3..1....0..3..3..3....0..3..3..3....0..0..0..3

..1..0..2..4....3..0..0..2....2..0..4..1....5..0..4..1....0..0..4..1

..0..4..0..4....2..1..0..1....4..4..0..3....1..4..0..5....2..2..0..0

..4..1..5..0....2..1..1..0....1..2..2..0....3..3..3..0....3..1..2..0

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Mar 09 2011

STATUS

approved

proposed

#1 by Ron Hardin at Wed Mar 09 12:49:39 EST 2011

NAME

allocated for Ron Hardin

KEYWORD

allocated

STATUS

approved