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A296718
Number of n X n 0..1 arrays with each 1 adjacent to 0, 2 or 4 king-move neighboring 1's.
0
2, 9, 69, 1463, 72533, 6829945, 1554755519, 795154816254, 873530688734201, 2176677611148751106, 12104489126392507688318
OFFSET
1,1
COMMENTS
Diagonal of A296725.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..1..1..0..0. .0..1..0..0..0. .1..0..0..0..1
..0..0..0..1..0. .0..0..1..0..1. .0..0..0..1..0. .0..0..0..0..0
..1..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..1..0..1..0. .1..0..0..0..1. .1..1..0..0..0. .0..1..0..0..1
..0..1..1..1..0. .0..0..0..1..1. .1..0..0..0..0. .1..1..0..1..1
CROSSREFS
Cf. A296725.
Sequence in context: A232549 A369778 A284762 * A201862 A167016 A300014
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 19 2017
STATUS
approved