A302674 Number of n X n 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 8, 20, 63, 453, 6311, 92889, 1847358, 65801890, 3339677315, 218906752065, 21593578996507, 3271858745091063, 693762002728416501, 208397398216895893003, 93110263365139995537485

Offset: 1

Author

R. H. Hardin, Apr 11 2018

Keywords

• nonn

Comments

Diagonal of A302680.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..20

Crossrefs

Cf. A302680.