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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2017
STATUS
approved

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Last modified February 29 09:21 EST 2024. Contains 370418 sequences. (Running on oeis4.)