A296319 Number of nX7 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 neighboring 1.

13, 301, 2747, 37431, 490668, 6069953, 78105580, 994666167, 12644605701, 161191403242, 2052476777491, 26138049499179, 332906349627080, 4239664089907890, 53994948962929686, 687661857639787158

Offset

1,1

Comments

Column 7 of A296320.

Links

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

Example

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

Crossrefs

Cf. A296320.

Sequence in context: A317632 A076130 A035272 * A009119 A322734 A331657

Adjacent sequences: A296316 A296317 A296318 * A296320 A296321 A296322

Keyword

nonn

Author

R. H. Hardin, Dec 10 2017

Status

approved