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A302421
Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 11, 42, 372, 4231, 48037, 1171867, 30957683, 1262711362, 67345167687, 6258369400424
OFFSET
1,2
COMMENTS
Diagonal of A302427.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..0..1..0. .0..0..0..0..1. .0..1..0..1..0
..0..1..0..1..1. .0..1..1..1..0. .0..1..1..0..1. .1..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..1..0..0..1..0. .0..0..0..1..0. .0..1..0..1..1. .1..0..1..1..0
..1..0..1..0..0. .1..1..0..1..0. .0..1..0..1..0. .1..0..0..0..0
CROSSREFS
Cf. A302427.
Sequence in context: A149070 A066655 A352684 * A118166 A277888 A249568
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 07 2018
STATUS
approved