A318023 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

64, 700, 4495, 37030, 304184, 2495323, 20241433, 163342483, 1322465254, 10749863872, 87367578925, 711940702703, 5803066729053, 47351790800795, 386468872771749, 3155746216467970, 25773145361237488, 210537089088168161

Offset

1,1

Comments

Column 7 of A318024.

Links

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

Example

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

Crossrefs

Cf. A318024.

Sequence in context: A283337 A187620 A119287 * A320408 A223963 A372844

Adjacent sequences: A318020 A318021 A318022 * A318024 A318025 A318026

Keyword

nonn

Author

R. H. Hardin, Aug 12 2018

Status

approved