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A296108
Number of n X n 0..1 arrays with each 1 adjacent to 3 or 4 king-move neighboring 1's.
0
1, 2, 6, 16, 503, 29003, 1993970, 1061506422, 1365762093736, 2515747231264231
OFFSET
1,2
COMMENTS
Diagonal of A296115.
EXAMPLE
Some solutions for n=6
..1..1..0..0..0..0. .0..1..1..1..1..0. .0..1..0..1..1..0. .0..1..1..1..1..1
..1..1..0..0..1..1. .1..1..0..1..1..0. .1..1..1..0..1..1. .1..1..0..0..1..1
..1..0..0..0..1..1. .0..1..0..0..0..0. .0..1..0..0..1..0. .1..0..0..0..0..0
..0..1..0..0..0..0. .0..1..0..0..0..0. .1..0..0..0..1..0. .0..1..0..0..0..0
..0..1..1..0..0..0. .1..1..1..0..1..1. .1..1..1..1..1..0. .1..1..0..1..1..0
..0..1..1..0..0..0. .0..1..0..0..1..1. .0..1..0..1..0..0. .1..1..0..1..1..0
CROSSREFS
Cf. A296115.
Sequence in context: A325790 A144690 A317351 * A118305 A139629 A057497
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 04 2017
STATUS
approved