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A317519
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 248, 28760, 12547746, 20564214798, 126590463179356, 2927176521682308228, 254242270618216007072260, 82946242184337420844894726534
OFFSET
1,2
COMMENTS
Diagonal of A317525.
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..0..1..1. .0..0..0..1..0. .0..0..0..0..1. .0..0..1..0..0
..1..1..1..0..1. .1..0..1..1..1. .1..1..0..0..0. .0..1..1..0..0
..1..1..0..0..1. .0..1..0..1..1. .0..0..1..1..0. .1..1..1..0..1
..1..1..1..0..1. .0..1..1..0..1. .0..1..1..0..0. .1..0..0..1..0
CROSSREFS
Cf. A317525.
Sequence in context: A029751 A035036 A221518 * A300202 A347107 A138323
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 30 2018
STATUS
approved