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A304059
Number of n X n 0..1 arrays with every element unequal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
0
0, 3, 14, 661, 79185, 25507453, 23106300531, 55351295222420, 362287570737702640
OFFSET
1,2
COMMENTS
Diagonal of A304065.
EXAMPLE
Some solutions for n=5
..0..1..1..1..1. .0..0..0..1..1. .0..1..0..0..1. .0..1..0..0..1
..1..1..0..0..0. .1..1..0..0..0. .0..1..1..1..0. .1..0..0..1..0
..0..1..0..0..1. .0..1..1..0..1. .1..0..0..1..0. .0..1..1..1..0
..1..1..0..0..1. .0..1..1..0..0. .1..1..0..0..1. .0..0..1..1..0
..0..0..1..1..0. .0..1..0..1..1. .0..1..1..1..0. .1..0..0..0..1
CROSSREFS
Cf. A304065.
Sequence in context: A264748 A092987 A088334 * A305453 A305016 A316682
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 05 2018
STATUS
approved