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

1,1

Comments

Column 6 of A303682.

Links

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

Formula

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

Example

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

Crossrefs

Cf. A303682.

Sequence in context: A013200 A156694 A080171 * A304131 A304219 A305480

Adjacent sequences: A303677 A303678 A303679 * A303681 A303682 A303683

Keyword

nonn

Author

R. H. Hardin, Apr 28 2018

Status

approved