A300635 Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 15, 34, 97, 300, 1036, 3313, 11075, 37067, 122922, 407858, 1357514, 4523493, 15101162, 50477243, 168866252, 565232270, 1892399523, 6336697206, 21221333391, 71076453037, 238076082776, 797517130607, 2671722364414, 8950813865109

Offset

1,1

Comments

Column 4 of A300639.

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

Crossrefs

Cf. A300639.

Sequence in context: A366330 A300431 A300765 * A301357 A271909 A346641

Adjacent sequences: A300632 A300633 A300634 * A300636 A300637 A300638

Keyword

nonn

Author

R. H. Hardin, Mar 10 2018

Status

approved