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.
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.
Terms
- a(0) =1a(1) =325a(2) =52518a(3) =4173156a(4) =165533393a(5) =4118194905a(6) =73044448611a(7) =958018305487
External references
- oeis: A166220