A297525 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 3 neighboring 1s.

1, 276, 8931, 80436, 956810, 22251457, 424461759, 6257746155, 99189736172, 1760551954224, 30190892195574, 493945062481322, 8201194302960825, 138921386338813051, 2337797782100665953, 39010588017713112465

Offset

1,2

Comments

Row 7 of A297519.

Links

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

Example

Some solutions for n=4
..0..1..0..0. .1..0..0..0. .1..1..0..0. .0..0..0..0. .0..1..1..1
..1..0..0..0. .1..1..0..0. .1..0..1..1. .0..0..0..1. .0..1..0..0
..0..0..0..1. .1..0..0..0. .0..0..0..1. .0..1..1..0. .0..0..0..0
..0..0..1..0. .0..0..0..0. .0..1..0..1. .0..1..0..0. .0..0..1..0
..0..0..0..0. .0..1..1..1. .0..0..1..1. .0..0..0..0. .1..1..0..0
..0..0..0..0. .0..0..0..1. .0..0..0..0. .1..0..0..1. .0..0..1..1
..0..0..0..0. .1..1..0..0. .0..0..1..1. .1..1..1..1. .0..0..0..1

Crossrefs

Cf. A297519.

Sequence in context: A007246 A107080 A333049 * A169976 A297755 A166192

Adjacent sequences: A297522 A297523 A297524 * A297526 A297527 A297528

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved