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A299603
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
0, 4, 48, 466, 5125, 75970, 1284100, 30465069, 1069988410, 50612692651, 3442371498953
OFFSET
1,2
COMMENTS
Diagonal of A299607.
EXAMPLE
Some solutions for n=6
..0..0..1..0..0..0. .0..0..0..1..1..0. .0..1..0..1..1..0. .0..0..1..0..0..0
..1..1..1..1..1..0. .0..1..1..1..0..1. .1..0..1..1..0..1. .1..1..1..1..1..0
..1..1..1..1..1..0. .0..1..1..1..1..1. .0..1..1..1..1..0. .1..1..1..1..1..0
..0..0..1..1..1..1. .1..1..1..1..0..1. .1..1..1..1..1..1. .0..0..1..1..1..1
..0..1..0..1..1..0. .0..1..1..0..1..0. .1..0..1..1..1..0. .1..1..0..1..1..0
..1..0..0..1..1..0. .0..1..1..0..0..1. .0..1..0..1..0..1. .0..0..0..1..1..0
CROSSREFS
Cf. A299607.
Sequence in context: A297987 A298842 A298649 * A026942 A264727 A283049
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 14 2018
STATUS
approved