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

121, 1282, 49040, 1892418, 157053228, 26791709738, 7506000777648, 3820686512324000, 3744643102840746224, 6548923551070930502468, 20718929937864865377805260

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: A036928 A088171 A357169 * A036308 A066444 A206466

Adjacent sequences: A254967 A254968 A254969 * A254971 A254972 A254973

Keyword

nonn

Author

R. H. Hardin, Feb 11 2015

Status

approved