A303507 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 78, 1596, 72890, 8883058, 2346396384, 1203039901394, 1490405412540557

Offset

1,2

Comments

Diagonal of A303513.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A303513.

Sequence in context: A052603 A071556 A316203 * A145508 A266090 A366214

Adjacent sequences: A303504 A303505 A303506 * A303508 A303509 A303510

Keyword

nonn

Author

R. H. Hardin, Apr 25 2018

Status

approved