login
A318009
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 8, 118, 3062, 133136, 10674882, 1493271874, 372575745070, 164750515621344, 129310307945204804, 180180042920234266842, 445515876091580535689544
OFFSET
1,2
COMMENTS
Diagonal of A318016.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..1..0..0..0..1. .1..0..0..0..0. .0..1..1..1..0. .0..0..0..1..1
..0..0..0..0..1. .0..0..0..0..0. .1..1..1..1..1. .1..1..1..1..1
..0..0..0..1..1. .0..0..0..0..1. .0..0..1..1..1. .0..1..1..1..0
..0..0..1..1..0. .0..1..1..1..0. .0..0..0..0..1. .0..0..1..1..0
CROSSREFS
Cf. A318016.
Sequence in context: A194494 A230911 A267752 * A368911 A228752 A360978
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 12 2018
STATUS
approved