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A298576
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 78, 765, 16521, 708805, 40964223, 4776371282, 1079598223972
OFFSET
1,2
COMMENTS
Diagonal of A298582.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..0..0..0..0. .0..1..1..1..0. .0..0..0..0..0
..0..1..0..1..0. .1..1..1..1..1. .1..0..0..0..1. .1..0..0..0..1
..1..0..1..0..1. .0..1..1..1..0. .1..0..0..0..1. .1..0..1..0..1
..1..0..0..0..1. .0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0
..0..0..0..0..0. .1..1..0..1..1. .0..1..0..1..0. .1..0..1..0..1
CROSSREFS
Cf. A298582.
Sequence in context: A104530 A297952 A298771 * A299568 A031884 A337284
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2018
STATUS
approved