A268760 Number of n X n binary arrays with some element plus some horizontally, vertically, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 6, 56, 1148, 32056, 1552272, 127676872, 18045771274, 4495138018796, 1955829240647962, 1511334747222697904, 2064152526111916503300, 5022957354228609008158500, 21748481726801956896608976098

Offset: 1

Author

R. H. Hardin, Feb 13 2016

Keywords

• nonn

Comments

Diagonal of A268766.

Examples

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

Links

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

Crossrefs

Cf. A268766.