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A301394
Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 1, 3, 78, 4857, 885003, 528025038, 956047339302, 5338842851150762, 91544753173766016191, 4821728266187979354515714
OFFSET
1,3
COMMENTS
Diagonal of A301400.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..1..1
..0..1..1..0..0. .0..0..1..0..0. .0..0..0..1..1. .0..0..1..1..1
..0..1..1..0..1. .0..1..1..0..1. .0..0..0..1..1. .1..1..0..1..1
..0..0..1..1..1. .0..0..0..1..1. .0..1..0..0..0. .1..0..0..1..1
..0..0..1..1..1. .0..0..1..1..1. .1..1..0..0..0. .1..1..1..1..1
CROSSREFS
Cf. A301400.
Sequence in context: A097802 A119200 A197888 * A271182 A306817 A306818
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2018
STATUS
approved