A166178 Number of nXnXn triangular nonnegative integer arrays with all sums of an element and its neighbors <= 6

1, 7, 84, 1072, 73383, 11347520, 3274136129, 2837230608103, 5852047214414019

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Example

Some solutions for n=4
.....0........2........3........4........0........3........0........0...
....2.1......1.1......1.2......0.1......1.2......1.0......0.1......1.0..
...1.0.1....2.0.1....0.0.0....0.0.0....0.0.0....1.0.0....1.0.0....2.1.0.
..2.0.0.1..3.0.0.4..1.0.1.2..6.0.0.1..4.0.0.4..0.2.1.2..1.1.2.3..1.1.0.3
------
.....3........2........1........1........3........0........2........2...
....1.1......1.0......0.3......2.1......0.1......0.1......0.0......0.1..
...1.0.0....3.0.0....1.0.2....1.0.0....0.0.2....0.0.2....0.0.1....0.1.0.
..2.0.2.2..2.0.0.3..1.0.0.0..0.0.2.0..1.1.2.0..1.0.0.2..3.1.1.0..3.1.1.3

Crossrefs

Sequence in context: A099674 A067413 A370779 * A346582 A234510 A341966

Adjacent sequences: A166175 A166176 A166177 * A166179 A166180 A166181

Keyword

nonn

Author

R. H. Hardin Oct 09 2009

Status

approved