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A317691
Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 5, 14, 141, 6984, 585418, 526480617, 1721401739325, 14558324850764323
OFFSET
1,2
COMMENTS
Diagonal of A317697.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..1..1..0..0. .0..1..0..1..1. .0..0..0..0..0
..0..0..0..0..1. .1..1..1..1..0. .0..0..0..1..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..1..0..0. .1..1..1..1..0. .0..0..0..0..0
..0..0..0..1..1. .1..1..0..1..1. .1..0..0..0..1. .1..0..0..1..0
..0..0..0..0..1. .1..0..0..1..0. .0..0..0..0..0. .1..1..0..1..1
CROSSREFS
Cf. A317697.
Sequence in context: A027304 A070135 A317037 * A067857 A027832 A128946
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 04 2018
STATUS
approved