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A299873
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 125, 3068, 54005, 2714797, 213883244, 29310012663
OFFSET
1,2
COMMENTS
Diagonal of A299879.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..1..0..1. .0..1..1..1..0. .0..1..0..1..1
..1..1..0..0..0. .1..0..1..0..1. .0..1..0..1..0. .0..0..1..0..0
..1..1..0..0..0. .1..1..1..1..0. .1..1..0..1..1. .0..0..1..1..1
..1..1..0..0..1. .0..0..0..1..0. .0..0..0..0..0. .1..0..0..0..1
..1..0..1..0..1. .0..1..0..1..1. .0..1..0..0..1. .1..1..0..0..0
CROSSREFS
Cf. A299879.
Sequence in context: A299346 A009370 A299091 * A009372 A051102 A299009
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2018
STATUS
approved