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A305356
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 13, 26, 137, 538, 4429, 33136, 321576, 4146990, 63233103
OFFSET
1,2
COMMENTS
Diagonal of A305360.
EXAMPLE
Some solutions for n=5:
..0..1..0..0..1. .0..0..1..1..1. .0..1..1..0..1. .0..0..0..1..1
..0..1..1..0..1. .0..0..1..1..1. .0..1..0..0..0. .1..1..1..0..0
..1..0..0..1..1. .1..1..1..0..0. .1..0..0..0..1. .0..1..0..0..0
..0..1..1..0..1. .1..1..0..1..0. .0..1..0..1..1. .1..1..1..0..0
..1..0..0..1..0. .0..0..1..0..1. .1..0..1..0..0. .0..0..0..1..1
CROSSREFS
Cf. A305360.
Sequence in context: A189581 A206804 A304003 * A304946 A316616 A119652
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 31 2018
STATUS
approved