A303680 Number of nX6 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.

13, 49, 39, 64, 110, 177, 245, 335, 467, 657, 949, 1391, 2035, 2937, 4221, 6079, 8771, 12657, 18269, 26383, 38091, 54969, 79317, 114471, 165219, 238457, 344157, 496719, 716907, 1034681, 1493309, 2155247, 3110611, 4489449, 6479477, 9351631, 13496923

Offset: 1

Author

R. H. Hardin, Apr 28 2018

Keywords

• nonn

Comments

Column 6 of A303682.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A303682.

Formula

Empirical: a(n) = a(n-1) +a(n-4) +a(n-7) for n>12