login
A303405
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 28, 168, 4013, 236326, 24386918, 4298730424, 1222253462556
OFFSET
1,2
COMMENTS
Diagonal of A303410.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..1..0..0. .0..1..0..1..0. .0..1..1..1..0
..0..0..1..0..0. .0..0..1..1..0. .1..0..1..0..1. .1..0..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..0
..0..1..1..1..0. .0..1..0..0..1. .0..1..1..1..1. .0..1..1..1..0
..0..0..1..0..0. .1..0..1..1..0. .1..0..0..0..1. .0..0..1..0..0
CROSSREFS
Cf. A303410.
Sequence in context: A012762 A012778 A302522 * A074922 A285365 A366689
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 23 2018
STATUS
approved