A166220 Number of 12 X 12 X 12 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

1, 325, 52518, 4173156, 165533393, 4118194905, 73044448611, 958018305487, 9916013916442, 84913600697770

Offset

0,2

Links

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

Crossrefs

Sequence in context: A298106 A266365 A340462 * A121000 A290949 A048909

Adjacent sequences: A166217 A166218 A166219 * A166221 A166222 A166223

Keyword

nonn,more

Author

R. H. Hardin, Oct 09 2009

Status

approved