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A306054
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 27, 164, 3572, 99928, 3363541, 257823074, 35799252324, 7129093557510
OFFSET
1,2
COMMENTS
Diagonal of A306060.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..1..0..0..0. .0..0..0..1..0. .0..1..0..0..0
..0..0..0..0..0. .1..0..0..0..0. .0..0..0..0..1. .1..0..0..0..0
..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..0
..1..0..0..1..1. .1..0..0..0..1. .1..1..0..1..0. .0..0..0..0..1
..0..1..0..0..0. .1..0..0..0..0. .1..1..1..0..0. .0..0..0..0..1
CROSSREFS
Cf. A306060.
Sequence in context: A278358 A274751 A015534 * A218274 A061693 A005974
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 18 2018
STATUS
approved