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A318548
Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
2, 10, 21, 64, 219, 589, 1782, 5621, 17333, 54199, 169770, 532625, 1674674, 5267287, 16571936, 52167148, 164217643, 517100360, 1628230629, 5127481455, 16147257228, 50851033975, 160145034188, 504341598687, 1588336701913, 5002186675765
OFFSET
1,1
COMMENTS
Column 4 of A318552.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..0..0. .0..1..1..0. .0..1..0..1. .0..1..0..0
..0..0..0..1. .1..0..1..0. .1..1..0..0. .1..1..1..1. .0..0..0..1
..1..0..0..0. .0..0..0..1. .1..1..1..1. .1..1..1..0. .0..0..0..0
..0..0..1..0. .0..1..1..1. .0..1..1..1. .0..1..1..1. .1..0..0..0
..0..1..1..0. .0..1..1..0. .1..0..1..0. .1..1..0..1. .0..1..0..1
CROSSREFS
Cf. A318552.
Sequence in context: A296555 A231376 A304700 * A318210 A080881 A138298
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 28 2018
STATUS
approved