A193836 Number of nXnXn triangular 0..6 arrays with no element equal to the sum or difference mod 7 of any two of its neighbors

7, 216, 2214, 100182, 12248028, 3441628488, 2541579263184, 4630582277026170

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 4X4X4
.....4........2........1........4........4........2........3........1
....1.1......2.2......1.4......1.1......4.1......2.3......3.2......4.4
...1.4.1....3.3.3....1.4.1....1.1.1....4.4.1....3.3.2....3.3.2....1.1.4
..1.4.1.4..3.3.3.3..4.4.4.4..4.1.1.1..4.4.4.1..2.3.3.3..2.3.2.2..1.1.4.4

Crossrefs

Sequence in context: A012862 A045760 A046033 * A193877 A193186 A114939

Adjacent sequences: A193833 A193834 A193835 * A193837 A193838 A193839

Keyword

nonn

Author

R. H. Hardin Aug 06 2011

Status

approved