Number of 15X15X15 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
A166223
Number of 15X15X15 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
Terms
- a(0) =1a(1) =6460a(2) =14252749a(3) =10459516337
External references
- oeis: A166223