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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A303969.
LINKS
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

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Last modified May 18 18:37 EDT 2024. Contains 372664 sequences. (Running on oeis4.)