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A297987
Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
0
0, 4, 48, 466, 5100, 74675, 1276012, 30240388, 1056360518, 50037661325, 3406737828874, 353272517327686, 52791942245108114
OFFSET
1,2
COMMENTS
Diagonal of A297993.
EXAMPLE
Some solutions for n=6
..0..0..1..0..0..0. .0..1..1..1..1..0. .0..1..0..0..1..0. .0..1..1..1..1..1
..1..1..0..1..1..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .0..0..0..0..0..1
..0..1..0..1..0..1. .1..1..1..0..1..1. .0..1..0..1..1..1. .1..1..1..1..1..0
..0..0..0..1..0..0. .0..0..0..0..0..1. .0..1..0..1..0..1. .1..0..0..0..0..1
..0..1..0..1..1..0. .1..1..1..1..1..0. .0..1..0..1..0..1. .1..0..1..1..0..1
..0..1..1..0..0..1. .0..0..0..0..0..0. .1..1..0..1..1..0. .1..1..0..1..0..1
CROSSREFS
Cf. A297993.
Sequence in context: A059409 A357663 A297816 * A298842 A298649 A299603
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2018
STATUS
approved