A269029 Number of n X n 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 24, 348, 18384, 1326576, 208867428, 63310818360, 40013955378312, 51911512873697772, 140039775591497709312, 791864652110724378938904, 9334169232033820587188999592, 232675011644185023762453520339476

Offset: 1

Author

R. H. Hardin, Feb 18 2016

Keywords

• nonn

Comments

Diagonal of A269035.

Examples

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

Links

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

Crossrefs

Cf. A269035.