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A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's. 1
1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A297224.
LINKS
EXAMPLE
Some solutions for n=5
..1..1..0..0..0. .0..0..1..1..0. .1..1..0..0..0. .0..1..1..0..0
..0..0..0..0..0. .0..0..0..1..1. .0..1..1..0..0. .0..0..0..1..1
..0..1..1..0..0. .1..1..0..0..0. .0..0..1..1..0. .0..0..0..0..0
..0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1. .0..0..1..0..1
..0..0..0..0..0. .1..1..0..0..0. .1..1..0..0..0. .0..1..0..1..0
CROSSREFS
Cf. A297224.
Sequence in context: A240297 A050388 A241980 * A010039 A245407 A162314
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 27 2017
STATUS
approved

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Last modified June 8 04:57 EDT 2023. Contains 363157 sequences. (Running on oeis4.)