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A254970 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 and no column sum 0 0
121, 1282, 49040, 1892418, 157053228, 26791709738, 7506000777648, 3820686512324000, 3744643102840746224, 6548923551070930502468, 20718929937864865377805260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A254978

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A208261 A036928 A088171 * A036308 A176770 A066444

Adjacent sequences:  A254967 A254968 A254969 * A254971 A254972 A254973

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 11 2015

STATUS

approved

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Last modified January 19 22:04 EST 2022. Contains 350466 sequences. (Running on oeis4.)