A303308 Number of n X n 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 3, 12, 36, 139, 1221, 26184, 746323, 23967605, 1285074158, 140135122490, 23444843868325, 5152091496332058, 1785689257359207106, 1097023324108868377427, 1066418515771155179484946

Offset

1,2

Comments

Diagonal of A303314.

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

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

Crossrefs

Cf. A303314.

Sequence in context: A061130 A247008 A344062 * A155714 A282022 A004661

Adjacent sequences: A303305 A303306 A303307 * A303309 A303310 A303311

Keyword

nonn

Author

R. H. Hardin, Apr 21 2018

Status

approved