A166206 Number of n X n X n triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 11.

1, 12, 4, 16, 357, 1880, 26443, 1765534, 25412877, 1480441810, 406769105056, 17832789481005

Offset

0,2

Links

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

Crossrefs

Sequence in context: A181829 A339467 A199693 * A040137 A092237 A367323

Adjacent sequences: A166203 A166204 A166205 * A166207 A166208 A166209

Keyword

nonn

Author

R. H. Hardin, Oct 09 2009

Status

approved