A304264 Number of n X n 0..1 arrays with every element unequal to 0, 1, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 1, 6, 21, 146, 1246, 13767, 252509, 5755625, 177353720, 8354131403, 523250794396, 44173651472383, 5428616779817049, 920678621074132173, 212277158481925445968, 69198443091508695982216

Offset: 1

Author

R. H. Hardin, May 09 2018

Keywords

• nonn

Comments

Diagonal of A304270.

Examples

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

Links

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

Crossrefs

Cf. A304270.