A193367 Number of nXnXn triangular 0..2 arrays with no element equal to the product mod 3 of any two neighbors.

3, 16, 26, 65, 384, 3318, 40638, 689636, 16383974, 542420394, 25075022590, 1617185558560, 145563089994148, 18283036276489970, 3204638749437865046, 783848125594781710150, 267554112823378352976752

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

Some solutions for 4X4X4
.....0........2........2........0........2........2........0........2
....2.2......0.2......2.2......1.2......0.2......0.2......2.2......2.2
...2.2.2....2.2.0....2.0.2....1.0.1....2.2.0....2.2.2....2.2.0....0.2.2
..2.0.2.0..2.0.2.2..2.2.2.0..0.2.1.0..0.2.2.2..0.2.0.2..2.0.2.2..2.2.2.0

Crossrefs

Sequence in context: A256931 A101405 A335308 * A322413 A298873 A298876

Adjacent sequences: A193364 A193365 A193366 * A193368 A193369 A193370

Keyword

nonn

Author

R. H. Hardin, Jul 24 2011

Status

approved