A318090 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 23, 15, 1976, 8525, 68301, 504606, 4057433, 31285292, 240249513, 1835199684, 14224588572, 109059566554, 843075304556, 6476620099640, 49958130687711, 384425885605155, 2962333140940211, 22808849182759504, 175696908902774160

Offset

1,2

Comments

Column 7 of A318091.

Links

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

Example

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

Crossrefs

Cf. A318091.

Sequence in context: A124601 A040508 A305943 * A070716 A217894 A204598

Adjacent sequences: A318087 A318088 A318089 * A318091 A318092 A318093

Keyword

nonn

Author

R. H. Hardin, Aug 16 2018

Status

approved