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A298649
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 4, 48, 466, 5124, 75562, 1277500, 30337435, 1060912744, 50167771709, 3415576723102, 354153850821427
OFFSET
1,2
COMMENTS
Diagonal of A298653.
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..0..1..1..0. .0..0..1..0..1. .0..1..1..0..0
..0..0..1..1..0. .1..0..1..1..0. .1..1..1..1..0. .0..1..1..0..0
..1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1. .1..1..1..1..1
..1..1..1..1..0. .0..1..1..1..0. .0..0..1..1..0. .0..1..1..1..1
..0..0..1..0..1. .1..0..1..0..1. .0..1..1..0..1. .1..0..1..0..0
CROSSREFS
Cf. A298653.
Sequence in context: A297816 A297987 A298842 * A299603 A026942 A264727
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 24 2018
STATUS
approved