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A303519
Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 18, 103, 1758, 102779, 15768709, 6835357512, 8858057538977
OFFSET
1,2
COMMENTS
Diagonal of A303525.
EXAMPLE
Some solutions for n=5
..0..1..1..0..1. .0..1..1..1..0. .0..1..1..1..0. .0..1..1..0..1
..1..0..1..0..1. .1..1..1..1..1. .0..1..0..1..0. .1..1..1..1..0
..1..0..1..0..1. .0..1..1..1..0. .1..1..1..1..1. .0..1..1..1..1
..1..0..1..1..1. .0..1..0..1..0. .1..1..0..1..1. .0..0..0..1..1
..1..0..0..0..1. .0..1..0..0..0. .0..1..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A303525.
Sequence in context: A038158 A327828 A009021 * A124408 A136779 A106328
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 25 2018
STATUS
approved