Number of 13X13X13 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
A166221
Number of 13X13X13 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.
Terms
- a(0) =1a(1) =1195a(2) =433447a(3) =81325310a(4) =6511049130a(5) =283350411160
External references
- oeis: A166221