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A299122
Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 9, 232, 2636, 198753, 50126162, 17703574257, 28274774976231
OFFSET
1,2
COMMENTS
Diagonal of A299128.
EXAMPLE
Some solutions for n=5
..0..1..1..1..1. .0..1..1..1..0. .0..1..1..1..1. .0..1..1..0..0
..1..0..1..1..1. .0..1..1..1..1. .0..1..1..0..0. .0..1..1..1..1
..0..0..1..0..1. .0..0..1..1..1. .0..0..0..0..0. .0..0..1..0..0
..1..0..0..1..1. .1..0..1..0..1. .1..0..1..1..1. .0..0..1..0..0
..1..0..0..1..1. .0..1..1..1..0. .0..1..1..1..1. .1..1..1..1..1
CROSSREFS
Cf. A299128.
Sequence in context: A318615 A030074 A335723 * A377665 A167657 A175700
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 03 2018
STATUS
approved