A268808 Number of nX7 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

768, 4914, 48460, 640926, 8734264, 115671422, 1508087180, 19390335102, 246666802206, 3110082281974, 38924665296474, 484120668061458, 5988867204857378, 73740656947715536, 904257358969806890

Offset

1,1

Comments

Column 7 of A268809.

Links

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

R. H. Hardin, Empirical recurrence of order 68

Formula

Empirical recurrence of order 68 (see link above)

Example

Some solutions for n=3
..2..2..2..2..2..1..2. .0..0..0..1..0..0..0. .0..0..1..0..1..0..0
..2..2..2..2..2..2..1. .0..0..0..0..1..0..1. .1..0..0..1..0..0..1
..1..2..1..2..1..0..0. .0..1..0..0..0..0..1. .0..1..0..0..1..0..0

Crossrefs

Cf. A268809.

Sequence in context: A179668 A219317 A281238 * A183687 A269051 A282287

Adjacent sequences: A268805 A268806 A268807 * A268809 A268810 A268811

Keyword

nonn

Author

R. H. Hardin, Feb 13 2016

Status

approved