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A305453
Number of nXn 0..1 arrays with every element unequal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 14, 661, 79810, 25891309, 23996865179, 58862515324951, 398828631091652367
OFFSET
1,2
COMMENTS
Diagonal of A305457.
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..1..1..1..1. .0..1..0..1..1. .0..1..0..0..1
..0..1..1..0..1. .1..0..1..0..0. .0..1..0..0..0. .0..1..1..0..1
..0..1..0..0..1. .0..1..0..0..1. .1..1..0..0..1. .0..1..0..0..1
..1..0..0..0..1. .0..1..0..0..0. .0..1..1..0..1. .0..0..1..0..1
..1..0..1..0..1. .1..0..1..1..1. .1..0..1..1..0. .1..1..1..0..1
CROSSREFS
Cf. A305457.
Sequence in context: A092987 A088334 A304059 * A305016 A316682 A268158
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 01 2018
STATUS
approved