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A295207 Number of n X n 0..1 arrays with each 1 horizontally or vertically adjacent to 2 or 3 1's. 0
1, 2, 10, 147, 9536, 1245294, 444447937, 436106162865, 1123957773816109, 7694570450089060470, 140076394691747502547476 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 21 00:14 EDT 2021. Contains 347596 sequences. (Running on oeis4.)