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.

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A318346 A318347 A318348 * A318350 A318351 A318352

Keyword

nonn

Author

R. H. Hardin, Aug 24 2018

Status

approved