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A304348
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.
0
1, 5, 13, 101, 1540, 36201, 9176798, 4663483164, 4502196415629
OFFSET
1,2
COMMENTS
Diagonal of A304355.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..0..1..1. .0..1..1..1..1. .0..1..1..1..0
..1..1..0..0..0. .1..0..0..0..1. .0..0..1..1..0. .0..0..0..0..0
..0..0..1..1..1. .0..0..0..0..0. .1..1..0..0..1. .0..0..1..1..1
..1..1..0..1..0. .0..0..0..0..0. .1..0..0..0..0. .1..0..1..1..0
..0..1..0..0..0. .1..0..0..0..1. .0..0..0..0..0. .0..0..1..0..0
CROSSREFS
Cf. A304355.
Sequence in context: A123622 A337749 A117340 * A305912 A180827 A117437
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 11 2018
STATUS
approved