A302629 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 8, 33, 257, 2262, 30216, 652931, 18446157, 797627174, 48788464441, 4420985966927, 579498900792438, 110425750437014304, 30435339544089493297

Offset: 1

Author

R. H. Hardin, Apr 10 2018

Keywords

• nonn

Comments

Diagonal of A302635.

Examples

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

Crossrefs

Cf. A302635.