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A303634
Number of nX6 0..1 arrays with every element unequal to 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.
1
0, 5, 3, 22, 66, 394, 1417, 7706, 33066, 162051, 742361, 3551493, 16462120, 78105973, 365231748, 1722636470, 8082828137, 38044302672, 178718778290, 840640740209, 3950836581073, 18577968343323, 87329775332631, 410598309192529
OFFSET
1,2
COMMENTS
Column 6 of A303636.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..1..0..0..1. .0..1..1..0..1..0. .0..1..0..1..0..1. .0..1..0..1..0..1
..1..0..0..1..1..0. .1..0..0..1..0..1. .1..0..0..1..1..0. .1..0..1..1..0..0
..0..1..0..1..0..1. .0..1..1..1..0..0. .0..1..1..0..0..1. .1..0..1..0..1..1
..0..1..1..0..0..1. .0..1..0..0..1..1. .1..0..0..1..1..0. .0..1..1..0..1..0
..1..0..0..1..1..0. .1..0..1..0..1..0. .0..1..0..1..0..1. .1..0..0..1..0..1
CROSSREFS
Cf. A303636.
Sequence in context: A091593 A154825 A139699 * A069607 A128366 A083756
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 27 2018
STATUS
approved