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A305224
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 24, 116, 757, 7062, 135183, 4217359, 251711366, 26201772355, 5004642648682, 1701933414189511, 1046175213710985327, 1152072797809868185976, 2282648962854010752666780, 8117018772747629068352653449
OFFSET
1,2
COMMENTS
Diagonal of A305230.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..1..1..1. .0..0..0..0..1
..0..1..0..1..0. .0..0..0..1..0. .0..1..1..1..1. .0..1..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..0
..0..0..1..0..0. .1..0..0..1..0. .0..1..1..1..1. .0..0..0..0..0
..1..0..0..0..0. .1..1..0..0..0. .0..0..1..1..1. .0..0..0..0..1
CROSSREFS
Cf. A305230.
Sequence in context: A220706 A246030 A010566 * A182068 A092771 A279483
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 27 2018
STATUS
approved