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A304761
Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
0
0, 3, 16, 1321, 316639, 292676592, 969267512820, 11630662747620895, 503933308340733338752
OFFSET
1,2
COMMENTS
Diagonal of A304767.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..0..0..0. .0..1..0..1..0. .0..1..0..0..0
..1..0..1..0..1. .1..1..1..1..1. .0..1..1..0..1. .0..1..0..1..1
..0..0..0..0..0. .1..0..0..1..0. .1..0..1..1..0. .0..1..0..0..1
..0..1..1..1..1. .1..0..0..0..1. .1..0..0..1..1. .0..0..1..0..1
..0..1..0..0..0. .0..1..0..1..0. .0..1..0..0..0. .1..1..1..0..1
CROSSREFS
Cf. A304767.
Sequence in context: A297118 A002794 A132559 * A316507 A317459 A080273
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 18 2018
STATUS
approved