A305221 Number of nX6 0..1 arrays with every element unequal to 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 33, 92, 581, 3759, 32193, 212231, 1501520, 11428272, 82788295, 601647440, 4447036141, 32663330138, 239187497366, 1758196300720, 12921796884470, 94848943898420, 696669449190400, 5118201492429397, 37589849155190822

Offset

1,2

Comments

Column 6 of A305223.

Links

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

Example

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

Crossrefs

Cf. A305223.

Sequence in context: A231460 A114069 A350220 * A316799 A165378 A098938

Adjacent sequences: A305218 A305219 A305220 * A305222 A305223 A305224

Keyword

nonn

Author

R. H. Hardin, May 27 2018

Status

approved