A318337 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 6, 20, 67, 393, 4133, 86487, 3590263, 285034170, 43174729552, 12383193287684, 6712873423988949, 6871475875643572553, 13272675681120501977922, 48367944991570243925176462, 332490278773637201581189154380

Offset: 1

Author

R. H. Hardin, Aug 24 2018

Keywords

• nonn

Comments

Diagonal of A318343.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..17

Crossrefs

Cf. A318343.