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A317559
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 228, 20312, 5721314, 5059110002, 14085130453968, 123418919972164971, 3402595745984823716385
OFFSET
1,2
COMMENTS
Diagonal of A317565.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..1..1. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..1..1
..0..1..1..1..0. .1..0..0..1..1. .1..1..1..1..1. .0..1..1..1..0
..1..0..1..1..1. .0..0..0..1..0. .0..1..0..1..1. .0..0..1..0..1
..1..0..0..1..0. .0..0..1..1..0. .1..1..0..1..1. .1..0..0..0..0
CROSSREFS
Cf. A317565.
Sequence in context: A299655 A033508 A320365 * A302735 A300209 A300798
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 31 2018
STATUS
approved