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A302361
Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 2, 31, 77, 6580, 330505, 188443738, 169314399506, 675015247638492
OFFSET
1,2
COMMENTS
Diagonal of A302367.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..1..0
..1..1..0..0..1. .0..1..1..0..0. .1..0..1..0..0. .0..0..1..1..1
..0..1..0..0..0. .1..1..1..0..1. .0..0..1..0..1. .0..0..1..1..0
..1..1..1..0..1. .0..1..1..0..0. .0..0..1..0..0. .1..0..0..1..1
..1..1..1..0..1. .1..1..0..0..1. .1..0..0..0..0. .0..0..1..1..0
CROSSREFS
Cf. A302367.
Sequence in context: A105757 A091252 A031920 * A175446 A054207 A104095
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 06 2018
STATUS
approved