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A299181
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 75, 626, 3773, 59287, 1666826, 51863841, 3412264531
OFFSET
1,2
COMMENTS
Diagonal of A299187.
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..1..0..0..1. .0..0..1..0..0. .0..1..0..0..0
..1..0..0..1..1. .0..0..0..0..0. .1..0..1..1..0. .1..0..0..0..1
..0..0..1..0..0. .0..0..0..0..0. .0..1..0..1..1. .0..0..0..0..0
..0..0..0..0..1. .0..1..0..1..0. .1..0..1..1..1. .1..1..1..0..0
..1..0..0..1..1. .1..1..0..1..1. .0..0..1..0..1. .0..0..0..1..0
CROSSREFS
Cf. A299187.
Sequence in context: A222549 A196584 A301777 * A299944 A265657 A298214
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 04 2018
STATUS
approved