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A296967
Number of n X n 0..1 arrays with each 1 adjacent to 2, 4 or 5 king-move neighboring 1's.
0
1, 5, 31, 274, 13543, 1154298, 222799447, 143300513381, 227497889396792
OFFSET
1,2
COMMENTS
Diagonal of A296974.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..1..1..1. .0..0..1..1..1. .1..1..0..1..1
..0..1..1..1..0. .0..0..1..0..1. .0..1..1..1..0. .0..1..0..1..0
..1..0..0..0..1. .1..0..0..0..0. .1..1..0..0..0. .0..1..1..0..1
..0..1..1..1..0. .1..1..0..1..1. .1..1..0..0..0. .1..0..1..1..0
..1..1..1..1..1. .0..0..0..1..0. .1..0..0..0..0. .0..1..0..1..0
CROSSREFS
Cf. A296974.
Sequence in context: A259787 A273601 A218679 * A347416 A292462 A340392
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2017
STATUS
approved