A301606 Number of nX6 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 10, 26, 226, 1297, 8888, 60841, 421168, 2940940, 20639456, 145157471, 1021952648, 7197614571, 50704160874, 357234289578, 2517047832160, 17735602594473, 124970744650942, 880592489506775, 6205028171908948

Offset

1,2

Comments

Column 6 of A301608.

Links

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

Example

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

Crossrefs

Cf. A301608.

Sequence in context: A368503 A235053 A217583 * A281510 A024168 A043107

Adjacent sequences: A301603 A301604 A301605 * A301607 A301608 A301609

Keyword

nonn

Author

R. H. Hardin, Mar 24 2018

Status

approved