A269046 Number of n X n 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

3, 42, 594, 24192, 1643376, 242861616, 71430596250, 43961616939276, 56121206116838532, 149312689805356303800, 836315757545942679945480, 9777884421682321788379713444, 242268002268280142077867206348378

Offset: 1

Author

R. H. Hardin, Feb 18 2016

Keywords

• nonn

Comments

Diagonal of A269052.

Examples

			Some solutions for n=4
..2..0..1..2. .1..2..1..2. .0..2..1..0. .2..2..2..2. .0..2..1..2
..1..2..1..0. .1..2..1..0. .1..0..1..0. .1..1..2..2. .1..0..1..2
..1..2..1..0. .1..0..1..0. .0..0..0..0. .2..2..2..1. .0..0..1..0
..1..0..1..0. .1..2..0..0. .0..0..0..1. .1..2..2..2. .0..0..1..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..14

Crossrefs

Cf. A269052.