A300644 Number of nX6 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 19, 104, 1789, 28089, 456649, 7455411, 121708555, 1990954802, 32547397369, 532327808168, 8705226732028, 142365129531729, 2328217142648763, 38075317550124085, 622678903591246459, 10183203860874999028

Offset

1,2

Comments

Column 6 of A300646.

Links

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

Example

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

Crossrefs

Cf. A300646.

Sequence in context: A195461 A096328 A184190 * A142300 A238108 A129081

Adjacent sequences: A300641 A300642 A300643 * A300645 A300646 A300647

Keyword

nonn

Author

R. H. Hardin, Mar 10 2018

Status

approved