A303078 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 2, 32, 90, 11767, 409478, 266882021, 218955384065, 942790501392266

Offset

1,2

Comments

Diagonal of A303084.

Links

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

Example

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

Crossrefs

Cf. A303084.

Sequence in context: A139732 A037313 A122127 * A226395 A257965 A191997

Adjacent sequences: A303075 A303076 A303077 * A303079 A303080 A303081

Keyword

nonn

Author

R. H. Hardin, Apr 18 2018

Status

approved