A302664 Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 3, 43, 934, 42367, 3640304, 637088915, 219692176894, 138670742999582

Offset

1,2

Comments

Diagonal of A302670.

Links

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

Example

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

Crossrefs

Cf. A302670.

Sequence in context: A361878 A277496 A302218 * A201784 A364498 A340822

Adjacent sequences: A302661 A302662 A302663 * A302665 A302666 A302667

Keyword

nonn

Author

R. H. Hardin, Apr 11 2018

Status

approved