A301357 Number of nX4 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 15, 34, 101, 320, 1167, 3961, 13974, 49388, 171718, 595933, 2069269, 7184407, 24983410, 87005062, 303301112, 1058018103, 3691794974, 12883245735, 44960338427, 156905033430, 547579453383, 1911021086139, 6669509723637

Offset

1,1

Comments

Column 4 of A301361.

Links

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

Example

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

Crossrefs

Cf. A301361.

Sequence in context: A300431 A300765 A300635 * A271909 A346641 A075541

Adjacent sequences: A301354 A301355 A301356 * A301358 A301359 A301360

Keyword

nonn

Author

R. H. Hardin, Mar 19 2018

Status

approved