A297320 Number of 7Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

1, 1897, 85041, 1717882, 90535227, 4869858862, 197589351469, 8462603863772, 387143404127578, 17208423873690915, 757092974470971658, 33594816998930823407, 1491858261000140438998, 66127149761814467849317

Offset

1,2

Comments

Row 7 of A297314.

Links

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

Example

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

Crossrefs

Cf. A297314.

Sequence in context: A020417 A218848 A219427 * A220392 A219416 A221041

Adjacent sequences: A297317 A297318 A297319 * A297321 A297322 A297323

Keyword

nonn

Author

R. H. Hardin, Dec 28 2017

Status

approved