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A297513
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 3 neighboring 1's.
0
1, 5, 49, 624, 19187, 1995817, 424461759, 156485261895, 131486609293366, 286750273002748274, 1339067174781497822377
OFFSET
1,2
COMMENTS
Diagonal of A297519.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..1..0..1..1. .0..0..1..0..0. .0..0..1..0..0
..1..0..0..0..0. .1..1..0..0..0. .1..1..0..0..0. .0..0..0..1..1
..0..0..0..1..0. .0..1..0..1..0. .1..0..0..0..0. .1..1..0..0..1
..1..1..0..1..1. .0..0..0..0..1. .0..0..1..1..1. .0..0..0..0..0
..0..0..0..1..0. .1..1..0..0..0. .0..0..0..0..1. .0..0..0..0..0
CROSSREFS
Cf. A297519.
Sequence in context: A112241 A216483 A243945 * A228511 A116873 A324361
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2017
STATUS
approved