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A304888
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 11, 246, 3145, 123297, 7309444, 527157688, 106200560327, 22393951865040
OFFSET
1,2
COMMENTS
Diagonal of A304894.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..1..0..1..1. .0..1..0..0..1. .0..1..1..0..1
..1..0..0..1..1. .1..0..0..0..0. .0..1..1..1..0. .1..0..0..0..1
..1..0..1..0..0. .0..0..1..0..0. .1..1..1..1..0. .0..1..0..0..0
..0..0..0..0..0. .1..0..0..1..1. .0..1..1..1..0. .1..1..1..0..1
..1..1..0..1..1. .0..1..0..1..1. .1..0..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A304894.
Sequence in context: A305277 A118197 A092658 * A316572 A216571 A299046
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 20 2018
STATUS
approved