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A296820
Number of n X n 0..1 arrays with each 1 adjacent to 2, 3 or 4 king-move neighboring 1's.
0
1, 6, 94, 2272, 510086, 267542809, 364592446431, 2034946979145210, 34966993876417278748
OFFSET
1,2
COMMENTS
Diagonal of A296827.
EXAMPLE
Some solutions for n=4
..0..0..1..1. .1..1..0..0. .1..1..1..1. .0..0..0..0. .0..0..0..0
..1..1..0..1. .0..1..0..0. .1..0..0..1. .0..0..0..0. .1..1..1..0
..0..1..0..1. .0..1..0..0. .0..1..1..0. .1..1..1..0. .0..1..1..0
..0..0..1..1. .1..1..1..0. .0..0..1..1. .0..1..0..0. .0..0..0..0
CROSSREFS
Cf. A296827.
Sequence in context: A221525 A321073 A198257 * A184983 A184980 A184981
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 21 2017
STATUS
approved