A303618 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 2, 38, 325, 37910, 6446485, 6323564388, 18955122420980, 214926958781186214

Offset

1,2

Comments

Diagonal of A303624.

Links

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

Example

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

Crossrefs

Cf. A303624.

Sequence in context: A214909 A226402 A217214 * A179503 A126731 A216357

Adjacent sequences: A303615 A303616 A303617 * A303619 A303620 A303621

Keyword

nonn

Author

R. H. Hardin, Apr 27 2018

Status

approved