A303236 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 2, 18, 10, 1106, 7823, 686376, 48315454, 9508520220, 3548066642083

Offset

1,2

Comments

Diagonal of A303242.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A303242.

Sequence in context: A132629 A288161 A302454 * A174708 A328648 A359197

Adjacent sequences: A303233 A303234 A303235 * A303237 A303238 A303239

Keyword

nonn

Author

R. H. Hardin, Apr 20 2018

Status

approved