A300640 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 2, 64, 2998, 456649, 209156119, 280782187131, 1114340919987573, 12994612967873847001, 446094799302794492462850

Offset: 1

Author

R. H. Hardin, Mar 10 2018

Keywords

• nonn

Comments

Diagonal of A300646.

Examples

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

Crossrefs

Cf. A300646.