A295207 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's.

1, 2, 10, 147, 9536, 1245294, 444447937, 436106162865, 1123957773816109, 7694570450089060470, 140076394691747502547476

Offset

1,2

Comments

Diagonal of A295213.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A295213.

Sequence in context: A152804 A188490 A317075 * A213457 A060595 A303440

Adjacent sequences: A295204 A295205 A295206 * A295208 A295209 A295210

Keyword

nonn

Author

R. H. Hardin, Nov 17 2017

Status

approved