A303634 Number of nX6 0..1 arrays with every element unequal to 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

0, 5, 3, 22, 66, 394, 1417, 7706, 33066, 162051, 742361, 3551493, 16462120, 78105973, 365231748, 1722636470, 8082828137, 38044302672, 178718778290, 840640740209, 3950836581073, 18577968343323, 87329775332631, 410598309192529

Offset

1,2

Comments

Column 6 of A303636.

Links

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

Example

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

Crossrefs

Cf. A303636.

Sequence in context: A091593 A154825 A139699 * A069607 A128366 A083756

Adjacent sequences: A303631 A303632 A303633 * A303635 A303636 A303637

Keyword

nonn

Author

R. H. Hardin, Apr 27 2018

Status

approved