A302218 Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 43, 934, 40395, 3420704, 553097760, 177191137344, 102914156897887, 122108799039662692

Offset: 1

Author

R. H. Hardin, Apr 03 2018

Keywords

• nonn

Comments

Diagonal of A302224.

Examples

			Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1
..1..1..1..1..1. .1..1..0..0..1. .1..1..1..0..1. .1..0..1..0..1
..1..0..0..0..1. .1..1..1..1..1. .0..0..0..1..0. .0..1..1..0..0
..0..1..1..1..0. .0..0..0..0..0. .1..1..0..1..1. .0..0..0..1..0
..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .1..1..1..1..1
		

Crossrefs

Cf. A302224.