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A318349
Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
21, 30, 71, 106, 279, 842, 2429, 7451, 22996, 70762, 218768, 677035, 2090867, 6478680, 20058184, 62168555, 192733963, 597744210, 1854283003, 5753186642, 17852343400, 55399248790, 171922042756, 533541165687, 1655798511324
OFFSET
1,1
COMMENTS
Column 7 of A318350.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..0..0..0..0..0. .0..0..0..0..0..0..1. .0..0..0..0..0..1..0
..0..0..0..0..0..1..0. .0..0..0..0..0..0..0. .0..0..0..0..0..1..1
..0..0..1..0..0..0..0. .0..1..0..0..0..0..0. .0..0..0..1..0..1..1
..0..0..0..0..0..0..0. .0..0..0..1..0..0..0. .0..0..0..0..0..0..1
..0..0..0..0..0..0..0. .0..0..0..0..0..0..0. .0..0..0..0..0..0..0
CROSSREFS
Cf. A318350.
Sequence in context: A318081 A276655 A187965 * A228142 A276756 A115433
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 24 2018
STATUS
approved