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A316298
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 20, 114, 1519, 20780, 608947, 26898537, 2095245767, 277347563288
OFFSET
1,2
COMMENTS
Diagonal of A316304.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..0..0..0. .0..0..1..1..1. .0..0..0..0..0
..1..0..1..0..1. .1..0..0..1..0. .0..1..0..1..1. .0..0..0..1..0
..0..0..0..1..1. .0..0..0..0..0. .0..0..1..1..1. .0..0..0..0..0
..0..0..0..0..1. .0..1..0..0..1. .0..0..0..1..1. .0..1..0..0..0
..1..1..0..0..1. .0..0..0..1..0. .0..0..1..0..1. .0..0..0..1..1
CROSSREFS
Cf. A316304.
Sequence in context: A028475 A128327 A320615 * A291531 A171802 A361245
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 29 2018
STATUS
approved