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A297014
Number of n X n 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1's.
0
1, 2, 8, 46, 852, 74534, 11172600, 5380073625, 8482089381228
OFFSET
1,2
COMMENTS
Diagonal of A297020.
EXAMPLE
Some solutions for n=6
..1..1..0..1..1..0. .1..1..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..1..0
..1..1..1..0..1..1. .1..1..1..0..1..0. .0..1..1..1..1..1. .0..0..0..1..1..0
..0..1..1..1..1..1. .0..0..0..1..1..1. .1..1..1..0..1..1. .0..0..1..0..0..0
..0..0..0..0..0..0. .0..0..1..0..0..1. .1..1..0..1..0..1. .0..1..0..1..1..1
..1..1..1..1..1..0. .0..1..1..0..1..1. .0..0..0..1..1..1. .1..1..0..0..1..1
..1..1..0..1..1..0. .0..0..1..1..1..0. .0..0..0..0..1..1. .1..1..0..0..0..0
CROSSREFS
Cf. A297020.
Sequence in context: A099765 A246386 A096656 * A102009 A254747 A298698
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 23 2017
STATUS
approved