A318539 Number of n X n 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 1, 6, 31, 247, 2905, 46165, 1143583, 41368803, 2165406865, 168220637918, 19176703676628, 3204799103321623, 788247777299643666, 284810105663632654341, 151134158955831615046217

Offset: 1

Author

R. H. Hardin, Aug 28 2018

Keywords

• nonn

Comments

Diagonal of A318545.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21

Crossrefs

Cf. A318545.