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A317598
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 100, 3047, 218043, 40015089, 18167894481, 20471431125281, 58293522938785296
OFFSET
1,2
COMMENTS
Diagonal of A317604.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..1..0..0..0. .0..0..0..1..0. .0..1..0..0..0
..1..1..0..0..1. .1..1..0..0..0. .0..0..0..1..1. .0..0..0..1..0
..0..1..1..1..1. .1..1..1..1..1. .1..0..0..0..1. .0..1..0..0..0
..1..1..1..1..0. .1..1..1..1..1. .0..0..1..0..1. .0..1..0..0..1
..0..1..1..0..0. .1..1..0..1..1. .1..1..1..1..1. .1..0..0..0..0
CROSSREFS
Cf. A317604.
Sequence in context: A302944 A060570 A215875 * A238947 A291536 A229452
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 01 2018
STATUS
approved