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A302522
Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 28, 168, 3683, 182773, 16130212, 1916999716, 305442540368
OFFSET
1,2
COMMENTS
Diagonal of A302528.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..0..1..0. .0..0..0..0..0. .0..1..1..0..1
..0..0..0..0..1. .0..0..1..0..1. .0..1..0..1..0. .1..0..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..0..1..0..1. .0..0..0..0..0
..1..1..1..1..0. .0..0..1..0..1. .0..0..1..0..1. .0..1..1..0..0
..0..0..0..0..1. .0..1..0..1..0. .0..1..0..1..0. .0..0..1..1..0
CROSSREFS
Cf. A302528.
Sequence in context: A184440 A012762 A012778 * A303405 A074922 A285365
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2018
STATUS
approved