A300434 Number of nX7 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 223, 611, 1942, 6235, 21891, 75553, 267811, 932791, 3315683, 11885340, 42868902, 155779487, 569227959, 2088365879, 7693111276, 28421833699, 105230583357, 390303313749, 1449653167542, 5389870205511, 20056547681517, 74683273134149

Offset

1,1

Comments

Column 7 of A300435.

Links

R. H. Hardin, Table of n, a(n) for n = 1..170

Example

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

Crossrefs

Cf. A300435.

Sequence in context: A006919 A179122 A300349 * A300768 A300638 A301360

Adjacent sequences: A300431 A300432 A300433 * A300435 A300436 A300437

Keyword

nonn

Author

R. H. Hardin, Mar 05 2018

Status

approved