A269041 Number of 7Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.

0, 25272, 357756, 8277072, 159397596, 3266423688, 63310818360, 1232016734502, 23480085224460, 445037745455958, 8347562556153996, 155656709783860410, 2883687582601214532, 53163977044543395168, 975616567564729165860

Offset

1,2

Comments

Row 7 of A269035.

Links

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

R. H. Hardin, Empirical recurrence of order 92

Formula

Empirical recurrence of order 92 (see link above)

Example

Some solutions for n=2
..0..0. .1..2. .2..2. .0..0. .1..2. .1..0. .1..0. .1..2. .1..0. .2..2
..1..1. .1..2. .2..1. .1..0. .2..2. .0..2. .1..0. .1..0. .1..0. .2..1
..2..2. .1..0. .0..1. .1..2. .2..1. .1..0. .0..0. .1..2. .2..2. .0..1
..2..1. .0..1. .0..0. .2..0. .0..2. .1..2. .1..2. .2..2. .2..2. .2..1
..2..2. .0..1. .0..0. .1..2. .2..1. .1..0. .1..0. .1..0. .2..1. .1..2
..2..1. .0..1. .1..0. .2..2. .2..2. .1..2. .0..0. .1..2. .2..2. .1..0
..2..1. .0..1. .2..2. .2..1. .2..2. .1..0. .0..1. .2..2. .2..2. .0..0

Crossrefs

Cf. A269035.

Sequence in context: A046709 A179723 A174825 * A130615 A175741 A203090

Adjacent sequences: A269038 A269039 A269040 * A269042 A269043 A269044

Keyword

nonn

Author

R. H. Hardin, Feb 18 2016

Status

approved