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A305009
Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 14, 42, 2715, 28477, 640900, 108290760, 7783586346, 1272340558178
OFFSET
1,2
COMMENTS
Diagonal of A305015.
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..1..1..1..0. .0..1..0..1..0. .0..0..0..0..0
..1..0..1..1..0. .0..1..1..0..1. .0..0..0..0..1. .1..1..0..1..0
..0..0..0..0..0. .0..0..1..1..1. .0..0..0..0..0. .1..1..1..0..0
..1..0..1..1..0. .0..1..1..1..0. .1..1..0..0..1. .0..1..1..1..0
..1..0..1..1..0. .1..0..1..1..1. .0..0..0..0..0. .1..1..1..0..1
CROSSREFS
Cf. A305015.
Sequence in context: A124650 A291138 A063903 * A115005 A058389 A261481
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 23 2018
STATUS
approved