login
A318076
Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 5, 22, 51, 314, 1851, 15876, 139346, 1719340, 26691372, 570681324
OFFSET
1,2
COMMENTS
Diagonal of A318082.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..1..1..1
..0..0..0..1..1. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..1..1
..0..0..1..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..0. .1..0..0..0..0. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0. .0..0..1..1..1
CROSSREFS
Cf. A318082.
Sequence in context: A203192 A025098 A025117 * A124423 A209109 A212260
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 15 2018
STATUS
approved