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A297500 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 2 neighboring 1's. 0
1, 10, 110, 2281, 270845, 66289769, 28914051279, 44145856928170, 190314910908111935, 1690602288933775004206, 41411616264665765678770302 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297506.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A297506.

Sequence in context: A099883 A337351 A146753 * A305213 A181929 A339713

Adjacent sequences:  A297497 A297498 A297499 * A297501 A297502 A297503

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2017

STATUS

approved

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Last modified June 27 22:27 EDT 2022. Contains 354899 sequences. (Running on oeis4.)