login
A303962
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3 or 5 king-move adjacent elements, with upper left element zero.
0
1, 5, 13, 73, 452, 2597, 15517, 112219, 872394, 11451738, 151296576, 2289523848, 33405322777, 602039590188, 13334488672506
OFFSET
1,2
COMMENTS
Diagonal of A303969.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..1..0..0..0. .0..1..1..1..1. .0..0..0..0..0
..0..0..0..0..1. .0..0..0..0..1. .1..1..1..1..1. .1..0..0..0..0
..1..0..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..0
..1..1..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..0
..1..1..1..0..0. .0..0..0..0..1. .1..1..1..1..0. .0..0..0..1..0
CROSSREFS
Cf. A303969.
Sequence in context: A272645 A137702 A140120 * A304927 A163732 A208821
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 03 2018
STATUS
approved