A295345 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 0, 2 or 3 1's.

2, 8, 76, 1877, 123783, 22091007, 11500075769, 17390584281932, 75403580062034596, 925132781374075718095, 31778302417345693041196311

Offset

1,1

Comments

Diagonal of A295352.

Links

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

Example

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

Crossrefs

Cf. A295352.

Sequence in context: A002668 A193205 A303943 * A329968 A093062 A057984

Adjacent sequences: A295342 A295343 A295344 * A295346 A295347 A295348

Keyword

nonn

Author

R. H. Hardin, Nov 20 2017

Status

approved