A320401 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

64, 4105, 94842, 2908839, 83509525, 2392115850, 69104597430, 1987324601389, 57271367516963, 1649293396078122, 47501690934943189, 1368095396558548373, 39401919356219060903, 1134809125230760299100, 32683331680225837200024

Offset

1,1

Comments

Column 7 of A320402.

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..1. .0..0..0..0..0..1..0. .0..0..0..0..0..1..1
..0..0..0..1..1..1..1. .0..0..0..0..1..1..0. .0..0..0..1..0..0..0
..0..0..0..0..1..1..0. .0..0..0..1..0..1..0. .0..0..0..1..0..1..0
..0..0..1..1..1..0..0. .0..0..1..1..0..0..0. .0..0..1..1..0..1..1
..0..0..0..0..1..0..0. .0..0..1..1..0..0..1. .0..0..1..1..1..0..0

Crossrefs

Cf. A320402.

Sequence in context: A324490 A262396 A318015 * A203438 A264345 A099369

Adjacent sequences: A320398 A320399 A320400 * A320402 A320403 A320404

Keyword

nonn

Author

R. H. Hardin, Oct 12 2018

Status

approved