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A317814
Number of nX7 0..1 arrays with every element unequal to 0, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
1, 23, 9, 77, 230, 434, 1575, 4232, 10738, 32307, 97258, 284543, 844473, 2492174, 7314947, 21633856, 64114105, 190269195, 565469964, 1680638925, 4997924210, 14880430677, 44338998293, 132229102288, 394662334943, 1178729721030
OFFSET
1,2
COMMENTS
Column 7 of A317815.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..0..1..1..1. .0..0..0..1..0..1..0. .0..1..0..1..0..1..1
..1..1..1..0..0..0..0. .0..0..1..0..0..1..1. .1..0..0..1..0..0..0
..0..1..1..0..0..1..1. .0..1..1..0..0..1..0. .1..0..1..1..0..1..1
..0..1..1..1..1..1..0. .1..1..1..0..1..1..0. .0..1..1..0..1..1..0
..1..0..0..1..0..0..1. .0..0..1..0..1..0..1. .0..1..0..0..1..0..1
CROSSREFS
Cf. A317815.
Sequence in context: A040510 A134910 A278339 * A318422 A013360 A013491
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 07 2018
STATUS
approved