A265657 Number of 3Xn arrays containing n copies of 0..3-1 with no equal diagonal or antidiagonal neighbors and new values introduced sequentially from 0.

1, 7, 20, 104, 476, 2428, 12362, 64454, 342054, 1828533, 9928762, 54157257, 298686238, 1653956425, 9228016750, 51675269021, 290902199460, 1642884250719, 9314059354170, 52950162099266, 301906974462620, 1725418938358656

Offset

1,2

Comments

Row 3 of A265656.

Links

R. H. Hardin, Table of n, a(n) for n = 1..94

Example

Some solutions for n=4
..0..1..0..2....0..1..2..0....0..0..1..2....0..1..1..0....0..1..2..0
..0..1..0..1....2..1..2..1....2..2..1..2....2..2..2..2....0..1..2..0
..2..2..2..1....2..1..0..0....1..0..1..0....0..1..1..0....2..1..2..1

Crossrefs

Cf. A265656.

Sequence in context: A301777 A299181 A299944 * A298214 A299346 A009370

Adjacent sequences: A265654 A265655 A265656 * A265658 A265659 A265660

Keyword

nonn

Author

R. H. Hardin, Dec 12 2015

Status

approved