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A304413
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
0
1, 4, 23, 835, 98568, 32181958, 29251894460, 71613287309909, 478060061219665260
OFFSET
1,2
COMMENTS
Diagonal of A304419.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..1..0..1..1. .0..1..0..1..1. .0..0..1..1..1
..0..1..0..0..1. .1..1..1..0..0. .1..0..0..0..0. .1..1..1..0..0
..1..1..1..0..0. .0..0..1..0..1. .1..1..0..0..0. .1..0..0..0..1
..0..1..0..0..1. .1..0..0..1..1. .1..0..0..1..1. .0..0..0..0..1
..0..1..0..0..1. .0..1..0..1..0. .0..1..0..1..1. .1..1..1..1..0
CROSSREFS
Cf. A304419.
Sequence in context: A266919 A219464 A107765 * A316240 A305948 A317211
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 12 2018
STATUS
approved