A166207 Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 12

1, 13, 5, 19, 479, 2636, 42285, 3484228, 56578703, 4011008946, 1447700846889, 76408068978456

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Crossrefs

Sequence in context: A302208 A068662 A235366 * A121230 A299959 A278445

Adjacent sequences: A166204 A166205 A166206 * A166208 A166209 A166210

Keyword

nonn

Author

R. H. Hardin Oct 09 2009

Status

approved