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A317112
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 142, 5157, 392393, 67247490, 25956605294, 22069906835089, 42518510891269917
OFFSET
1,2
COMMENTS
Diagonal of A317118.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..1. .0..0..0..0..1
..0..1..0..1..1. .1..0..0..0..1. .1..0..0..0..0. .0..0..0..1..0
..0..0..0..0..0. .1..0..0..1..1. .1..0..1..0..1. .0..0..1..1..1
..0..0..0..0..0. .1..0..0..1..1. .0..0..0..1..1. .1..1..1..0..1
..1..1..0..0..0. .1..0..0..1..0. .1..0..0..1..1. .1..1..1..1..0
CROSSREFS
Cf. A317118.
Sequence in context: A305763 A180357 A373874 * A320396 A112464 A227875
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 21 2018
STATUS
approved