A268782 Number of n X n binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.

0, 5, 72, 1714, 67100, 4725018, 611932378, 148013550916, 67580406047498, 58605374440440754, 97015414668307967168, 307604236621005318739500, 1873151902121241161650454526, 21951627197224261891003815976598

Offset: 1

Author

R. H. Hardin, Feb 13 2016

Keywords

• nonn

Comments

Diagonal of A268789.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..26

Crossrefs

Cf. A268789.