A302157 Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 7, 29, 140, 635, 2853, 19993, 75825, 786161, 2915241, 49663915, 152854596, 4893607560, 13149908952, 764803558904, 1748158857032, 193883417013099, 378301363005384, 78801036106269590, 130887347815375440

Offset: 1

Author

R. H. Hardin, Apr 02 2018

Keywords

• nonn

Comments

Diagonal of A302163.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..22

Crossrefs

Cf. A302163.