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A295199 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 4 1's. 0
1, 2, 8, 42, 438, 8241, 279663, 17574795, 2023191364, 425872679440, 164093026377725, 115549694765467808, 148496731427890025827 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A295205.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=6

..0..0..0..0..0..0. .1..1..0..1..1..1. .0..1..1..1..1..1. .0..1..1..1..0..0

..1..1..1..1..0..0. .1..1..1..1..0..1. .0..1..0..0..0..1. .0..1..0..1..0..0

..1..0..0..1..1..0. .0..1..0..0..0..1. .1..1..0..1..1..1. .1..1..0..1..1..0

..1..0..0..0..1..0. .0..1..1..0..0..1. .1..0..1..1..0..0. .1..0..0..0..1..1

..1..1..1..1..1..1. .0..0..1..1..1..1. .1..1..1..0..0..0. .1..1..1..1..0..1

..0..0..0..0..1..1. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..1..1

CROSSREFS

Cf. A295205.

Sequence in context: A191994 A153524 A153552 * A191479 A197935 A267619

Adjacent sequences:  A295196 A295197 A295198 * A295200 A295201 A295202

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 16 2017

STATUS

approved

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Last modified June 22 04:06 EDT 2021. Contains 345367 sequences. (Running on oeis4.)