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A304296
Number of n X n 0..1 arrays with every element unequal to 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 3, 4, 62, 237, 2673, 47501, 555463, 25873708, 782284349, 32914635985, 3458153456492, 263002178989873, 36033069960036119
OFFSET
1,2
COMMENTS
Diagonal of A304302.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..0..0..0..0. .0..0..0..1..0. .0..0..1..0..0
..1..0..0..0..0. .1..0..1..0..1. .0..1..0..0..0. .1..0..0..0..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
..1..0..0..1..0. .0..0..0..0..0. .0..0..0..0..0. .0..1..0..0..0
..0..0..0..0..0. .0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0
CROSSREFS
Cf. A304302.
Sequence in context: A300368 A306521 A300369 * A076183 A348679 A011445
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2018
STATUS
approved