A295034 - OEIS

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

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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