A193835 Number of nXnXn triangular 0..5 arrays with no element equal to the sum or difference mod 6 of any two of its neighbors

6, 140, 1171, 68369, 15035559, 10716516295, 23359187769537, 153210141255907393, 3015630657158819868437, 178074077883475758948166301

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 4X4X4
.....3........3........2........1........1........4........3........4
....3.2......2.2......2.2......1.1......1.1......4.1......3.2......1.4
...2.2.2....3.3.2....2.3.3....1.4.1....4.1.1....1.4.4....3.3.2....1.1.1
..2.2.2.3..3.3.3.3..2.3.2.3..4.1.4.1..1.1.1.4..4.1.1.1..2.3.2.3..1.4.4.4

Crossrefs

Sequence in context: A335369 A335388 A123729 * A123728 A193876 A293124

Adjacent sequences: A193832 A193833 A193834 * A193836 A193837 A193838

Keyword

nonn

Author

R. H. Hardin Aug 06 2011

Status

approved