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A305169
Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 4, 410, 26810, 2549718, 1069089450, 830801270567, 1384315836778981
OFFSET
1,2
COMMENTS
Diagonal of A305175.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..0..1..1..1. .0..0..0..1..0. .0..1..1..1..0
..1..1..1..1..1. .1..1..1..0..0. .1..1..0..0..1. .1..0..0..1..0
..1..0..0..1..1. .1..0..1..1..0. .0..0..0..0..0. .1..1..1..1..1
..0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..0. .1..0..1..0..0
..1..1..0..1..1. .1..0..0..1..0. .1..1..1..0..1. .1..0..1..0..1
CROSSREFS
Cf. A305175.
Sequence in context: A304150 A305505 A069970 * A316759 A334471 A153063
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 26 2018
STATUS
approved