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A304927
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 5, 13, 73, 452, 2653, 15993, 118024, 920997, 12184613, 162877680, 2507024025, 36984184204, 682363665419
OFFSET
1,2
COMMENTS
Diagonal of A304931.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..1..1..1..1. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..0..0. .1..1..1..1..1. .1..0..0..0..0. .1..1..1..1..0
..0..0..0..0..0. .1..1..1..1..0. .0..0..0..0..0. .1..1..1..1..1
..0..0..0..0..1. .1..1..1..0..0. .0..0..0..0..0. .0..1..1..1..1
..1..0..0..0..0. .1..1..0..0..0. .1..0..0..0..1. .0..0..1..1..1
CROSSREFS
Cf. A304931.
Sequence in context: A137702 A140120 A303962 * A163732 A208821 A293259
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 21 2018
STATUS
approved