A269145 Number of n X n 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three exactly once.

0, 80, 13904, 7002040, 12637025328, 88082672552208, 2456638851763181776, 279573979783982763379528, 131383670545605944288719844352, 256961574793195204388371517319842144

Offset: 1

Author

R. H. Hardin, Feb 20 2016

Keywords

• nonn

Comments

Diagonal of A269152.

Examples

			Some solutions for n=3
..2..2..2. .1..1..1. .3..3..2. .1..1..0. .0..2..3. .2..2..3. .2..2..1
..3..3..1. .3..3..1. .3..3..2. .1..0..1. .2..3..1. .3..1..1. .2..0..1
..1..1..1. .3..3..2. .3..3..1. .2..0..0. .3..2..0. .1..3..3. .2..0..0
		

Crossrefs

Cf. A269152.