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A299328
Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 1, 8, 263, 46286, 27685946, 65181402152, 567774280392040, 18419330490239501061
OFFSET
1,3
COMMENTS
Diagonal of A299334.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..0..0..0. .0..0..1..1..0. .0..0..0..1..1
..0..1..1..0..1. .0..0..0..1..0. .0..1..1..0..0. .0..0..1..0..1
..1..0..1..0..1. .1..1..1..0..1. .1..1..1..0..0. .1..0..1..1..0
..1..0..0..1..1. .0..1..0..1..1. .1..1..0..0..0. .1..1..1..1..0
..1..1..0..0..1. .0..0..0..1..1. .1..0..0..0..0. .1..1..1..0..0
CROSSREFS
Cf. A299334.
Sequence in context: A300734 A081058 A003386 * A098275 A326920 A221606
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 07 2018
STATUS
approved