A166210 Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 15

1, 16, 6, 27, 977, 6434, 146337, 20390870, 470828929, 56179164262

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Crossrefs

Sequence in context: A084517 A070568 A161884 * A141078 A298830 A302215

Adjacent sequences: A166207 A166208 A166209 * A166211 A166212 A166213

Keyword

nonn

Author

R. H. Hardin Oct 09 2009

Status

approved