A318036 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

21, 91, 368, 1222, 6525, 32385, 204645, 1284756, 8133386, 51773454, 331053698, 2126470209, 13650378979, 87727825675, 563717129308, 3623363068053, 23291574091030, 149752468455094, 962944454411938, 6192412939272588

Offset

1,1

Comments

Column 7 of A318037.

Links

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

Example

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

Crossrefs

Cf. A318037.

Sequence in context: A203173 A194532 A065827 * A326164 A143843 A119109

Adjacent sequences: A318033 A318034 A318035 * A318037 A318038 A318039

Keyword

nonn

Author

R. H. Hardin, Aug 13 2018

Status

approved