A295550 Number of nX7 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 3 or 4 1s.

13, 276, 4374, 78434, 1385901, 24486926, 434357928, 7703929911, 136731507572, 2425791860562, 43046580346073, 763911860239486, 13556371257153923, 240573778392292406, 4269273591050766800, 75763525863454457902

Offset

1,1

Comments

Column 7 of A295551.

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

Crossrefs

Cf. A295551.

Sequence in context: A196973 A197560 A295096 * A320336 A133284 A012570

Adjacent sequences: A295547 A295548 A295549 * A295551 A295552 A295553

Keyword

nonn

Author

R. H. Hardin, Nov 23 2017

Status

approved