A303688 Number of nX6 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

0, 209, 108, 1744, 2809, 19068, 55382, 273621, 934066, 4202604, 15472710, 66178236, 253206464, 1054639996, 4118641264, 16900720621, 66776102270, 271648054383, 1080722426035, 4373896909559, 17472759594897, 70501053021557

Offset

1,2

Comments

Column 6 of A303690.

Links

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

Example

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

Crossrefs

Cf. A303690.

Sequence in context: A268091 A209300 A003740 * A080532 A153442 A159274

Adjacent sequences: A303685 A303686 A303687 * A303689 A303690 A303691

Keyword

nonn

Author

R. H. Hardin, Apr 28 2018

Status

approved