A269069 Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

2, 11, 123, 3288, 165607, 18220241, 4064720816, 1833956006577, 1778703508587227, 3374673365461249568, 14101540722268888633757, 114651904507399541002097761, 2060026489521744559823250922304, 72580676762280474254836112626897875

Offset: 1

Author

R. H. Hardin, Feb 19 2016

Keywords

• nonn

Comments

Diagonal of A269075.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..23

Crossrefs

Cf. A269075.