A255019 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 or 1 and no column sum 0 or 1

26, 134, 1489, 21854, 480456, 16789556, 896763036, 73759241667, 9393184984367, 1838801806417472, 553960321837762309, 257519518174289401196, 184540608154581393175412, 203698879433082432079178111

Offset

1,1

Comments

Diagonal of A255027

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=4
..1..1..1..1..0..1....1..0..1..1..1..1....1..1..1..0..1..1....1..0..1..1..1..0
..1..0..1..1..1..0....1..1..1..1..0..1....1..1..1..1..1..0....1..1..1..1..1..1
..1..1..1..0..1..1....1..1..0..1..1..1....0..1..1..1..1..1....1..1..1..1..1..1
..1..1..1..1..1..1....1..1..1..1..1..0....1..1..0..1..1..1....1..1..1..1..1..0
..1..1..1..1..0..1....1..1..1..1..1..1....1..1..1..1..1..1....0..1..1..1..1..1
..1..1..1..1..1..1....1..1..1..1..0..1....1..0..1..1..1..0....1..1..1..1..1..1

Crossrefs

Cf. A255027

Sequence in context: A042318 A264287 A166801 * A223418 A331458 A238917

Adjacent sequences: A255016 A255017 A255018 * A255020 A255021 A255022

Keyword

nonn

Author

R. H. Hardin, Feb 13 2015

Status

approved