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A317224
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 46, 490, 17039, 929233, 98315821, 35202633059, 29277174452171, 53088150169443705
OFFSET
1,2
COMMENTS
Diagonal of A317230.
EXAMPLE
Some solutions for n=5
..0..1..1..1..1. .0..0..0..0..1. .0..1..1..0..1. .0..0..1..1..0
..1..0..1..1..1. .0..0..0..0..0. .1..0..1..0..0. .0..1..1..0..0
..1..0..1..1..1. .0..0..1..0..0. .1..1..1..1..1. .1..1..1..1..1
..1..1..1..0..0. .0..1..1..0..1. .1..0..1..1..1. .1..0..1..1..1
..1..1..1..1..0. .1..1..1..1..1. .1..1..0..0..0. .1..1..1..1..1
CROSSREFS
Cf. A317230.
Sequence in context: A352094 A037070 A141788 * A368269 A132113 A376842
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 24 2018
STATUS
approved