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A304256
Number of n X n 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 8, 19, 116, 925, 10024, 185874, 4991758, 177599255
OFFSET
1,2
COMMENTS
Diagonal of A304263.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..1..1..1. .0..1..0..1..1. .0..0..1..1..0
..1..1..1..1..1. .1..1..0..0..0. .1..0..1..0..0. .1..1..0..0..1
..1..0..1..1..0. .1..0..0..0..0. .1..0..1..0..1. .1..1..1..0..1
..1..0..1..0..0. .0..0..0..1..1. .0..1..0..1..1. .0..0..1..0..1
..1..0..0..1..1. .1..0..1..1..0. .1..0..0..0..0. .1..0..0..1..0
CROSSREFS
Cf. A304263.
Sequence in context: A170900 A151347 A047093 * A060305 A009141 A090069
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 09 2018
STATUS
approved