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A317605
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 38, 472, 23031, 1624676, 271661553, 124728567511, 142629239303087
OFFSET
1,2
COMMENTS
Diagonal of A317611.
EXAMPLE
Some solutions for n=5
..0..0..1..0..1. .0..1..1..1..1. .0..0..1..1..1. .0..0..1..1..1
..1..1..1..1..1. .0..1..1..0..1. .1..1..1..1..1. .1..1..1..1..1
..1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..1
..1..1..1..0..0. .0..1..1..1..0. .0..1..1..1..0. .1..1..1..0..1
..1..1..1..0..0. .1..1..1..1..1. .1..1..1..1..0. .0..0..1..1..1
CROSSREFS
Cf. A317611.
Sequence in context: A192947 A234463 A194044 * A263376 A199813 A120974
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 01 2018
STATUS
approved