A318348 Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

13, 18, 41, 55, 136, 345, 842, 2167, 5544, 14244, 36572, 94381, 243153, 629090, 1626951, 4215276, 10927245, 28335336, 73504819, 190696269, 494767839, 1283719592, 3330784937, 8642038996, 22422738925, 58177733612, 150947560518

Offset

1,1

Comments

Column 6 of A318350.

Links

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

Example

Some solutions for n=5
..0..0..0..1..1..1. .0..1..1..1..1..0. .0..0..0..0..0..0. .0..0..0..0..1..1
..0..0..0..0..1..1. .0..0..1..1..1..1. .0..0..0..0..1..0. .0..0..0..0..0..1
..1..0..0..0..0..1. .0..0..0..1..1..1. .0..0..0..0..0..0. .0..1..0..0..0..0
..1..1..0..0..0..0. .0..0..0..0..1..1. .1..0..0..0..0..0. .0..0..0..0..0..0
..1..1..1..0..0..0. .1..0..0..0..0..1. .1..1..0..0..0..0. .0..0..0..0..0..0

Crossrefs

Cf. A318350.

Sequence in context: A037158 A318080 A066469 * A197704 A218626 A119149

Adjacent sequences: A318345 A318346 A318347 * A318349 A318350 A318351

Keyword

nonn

Author

R. H. Hardin, Aug 24 2018

Status

approved