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A299091
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 125, 2828, 42012, 2170819, 161247816, 20536604982, 5567500327979
OFFSET
1,2
COMMENTS
Diagonal of A299097.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..1..0..1..0. .0..1..0..1..1. .0..1..0..1..0
..1..0..1..1..1. .1..0..1..0..1. .0..0..1..0..0. .1..1..0..0..1
..0..0..0..0..0. .0..1..0..1..0. .0..0..1..1..1. .0..0..0..0..1
..1..1..0..1..0. .0..1..1..1..0. .1..0..1..1..0. .1..0..0..0..1
..0..1..0..1..1. .1..1..1..1..1. .0..1..0..0..1. .1..0..1..0..1
CROSSREFS
Cf. A299097.
Sequence in context: A298214 A299346 A009370 * A299873 A009372 A051102
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2018
STATUS
approved