A317895 Number of nX7 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 45, 1074, 25169, 741031, 20734591, 580702029, 16327953218, 458323749120, 12865640919987, 361242608740754, 10141976947455132, 284740846034105659, 7994281018770192184, 224444092268529045038, 6301399036645662384611

Offset

1,2

Comments

Column 7 of A317896.

Links

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

Example

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

Crossrefs

Cf. A317896.

Sequence in context: A010997 A163721 A292209 * A282929 A177728 A265615

Adjacent sequences: A317892 A317893 A317894 * A317896 A317897 A317898

Keyword

nonn

Author

R. H. Hardin, Aug 10 2018

Status

approved