A295034 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 2 1's.

1, 10, 140, 6686, 898493, 355281224, 411280569141, 1377458578461777, 13439667379225204666, 381706479329790703639253, 31542814403404743062254741113, 7585239934805237805543429969496485

Offset

1,2

Comments

Diagonal of A295040.

Links

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

Example

Some solutions for n=4
..0..1..1..0. .1..1..1..1. .1..0..0..0. .0..0..0..1. .1..0..1..1
..0..0..1..1. .1..0..0..1. .1..0..0..0. .0..0..1..1. .1..0..1..0
..1..0..0..1. .0..0..0..0. .1..0..0..0. .1..0..1..0. .0..0..0..1
..1..1..0..1. .0..1..1..1. .0..0..0..0. .1..1..0..0. .0..1..1..1

Crossrefs

Cf. A295040.

Sequence in context: A215289 A319578 A051618 * A221576 A254834 A093470

Adjacent sequences: A295031 A295032 A295033 * A295035 A295036 A295037

Keyword

nonn

Author

R. H. Hardin, Nov 12 2017

Status

approved