A303415 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 252, 30897, 14783632, 27575294129, 200493397340704, 5683010875200460450, 627998579658329070097348, 270542136528524318473547313146, 454367389836320183421616246521390670

Offset: 1

Author

R. H. Hardin, Apr 23 2018

Keywords

• nonn

Comments

Diagonal of A303421.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..12

Crossrefs

Cf. A303421.