A295090 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 3 1's.

1, 5, 33, 578, 21185, 1767431, 329926211, 137994394960, 129350877831211, 271756998888328388, 1279500367201581413204, 13501456561909863649426230

Offset

1,2

Comments

Diagonal of A295097.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A295097.

Sequence in context: A322178 A134152 A140424 * A350876 A268296 A212296

Adjacent sequences: A295087 A295088 A295089 * A295091 A295092 A295093

Keyword

nonn

Author

R. H. Hardin, Nov 14 2017

Status

approved