A303101 Number of nX7 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 2208, 128921, 8650205, 568099880, 37220475492, 2441756629583, 160164698180399, 10505922762123798, 689141410588573095, 45204400412352498100, 2965196935043545360686, 194503015320143538663000

Offset

1,1

Comments

Column 7 of A303102.

Links

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

Example

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

Crossrefs

Cf. A303102.

Sequence in context: A017415 A046246 A302380 * A302952 A151580 A173175

Adjacent sequences: A303098 A303099 A303100 * A303102 A303103 A303104

Keyword

nonn

Author

R. H. Hardin, Apr 18 2018

Status

approved