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A299880
Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 10, 247, 3127, 223094, 56762816, 20496493815, 32439092859262
OFFSET
1,2
COMMENTS
Diagonal of A299886.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..1..1..0..0. .0..1..0..0..1. .0..1..1..0..1
..0..0..0..1..0. .0..1..1..0..0. .1..0..0..1..0. .0..1..1..0..1
..0..0..1..1..1. .0..0..1..1..1. .1..1..1..1..1. .0..0..0..0..0
..0..0..0..1..0. .0..0..0..1..1. .0..1..0..0..1. .0..1..1..0..1
..1..1..0..0..1. .1..1..0..0..0. .1..0..0..0..1. .0..1..1..1..0
CROSSREFS
Cf. A299886.
Sequence in context: A102958 A321795 A220197 * A358928 A085649 A152396
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2018
STATUS
approved