A300431 Number of nX4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 15, 33, 87, 238, 697, 1942, 5656, 16487, 48053, 140187, 410230, 1200987, 3516338, 10303811, 30218936, 88682815, 260386129, 764851328, 2247357212, 6604868430, 19414622795, 57075791496, 167812063057, 493440845883, 1451046727997

Offset

1,1

Comments

Column 4 of A300435.

Links

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

Example

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

Crossrefs

Cf. A300435.

Sequence in context: A045486 A243469 A366330 * A300765 A300635 A301357

Adjacent sequences: A300428 A300429 A300430 * A300432 A300433 A300434

Keyword

nonn

Author

R. H. Hardin, Mar 05 2018

Status

approved