A193156 Number of nXnXn triangular 0..2 arrays with each element equal to the sum mod 3 of two neighbors

0, 1, 21, 1093, 172217, 81613877, 113899763795, 468482952092893, 5676720267644621509

Offset

1,3

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for 4X4X4
.....1........0........0........1........1........0........2........0
....2.2......2.1......1.2......1.0......2.2......1.2......1.1......2.1
...2.1.2....1.0.2....1.2.1....0.2.0....1.1.2....0.1.1....2.1.0....2.0.1
..2.0.1.0..2.1.1.0..1.0.1.2..0.0.1.1..2.1.2.1..2.2.0.1..0.1.0.0..0.1.1.2

Crossrefs

Sequence in context: A231521 A220637 A143003 * A012183 A012230 A357314

Adjacent sequences: A193153 A193154 A193155 * A193157 A193158 A193159

Keyword

nonn

Author

R. H. Hardin Jul 16 2011

Status

approved