A268910 Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

0, 159744, 5038848, 154472184, 4513169016, 129834259704, 3679171151832, 103095286509168, 2860978283523432, 78747017051741472, 2152203067541169000, 58462727175138511872, 1579670961301113123600, 42485047384554878027688

Offset

1,2

Comments

Row 7 of A268904.

Links

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

R. H. Hardin, Empirical recurrence of order 54

Formula

Empirical recurrence of order 54 (see link above)

Example

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

Crossrefs

Cf. A268904.

Sequence in context: A253729 A034210 A034212 * A223286 A223483 A202936

Adjacent sequences: A268907 A268908 A268909 * A268911 A268912 A268913

Keyword

nonn

Author

R. H. Hardin, Feb 15 2016

Status

approved