Numerator of the harmonic mean of the first n 9-gonal numbers.
A250548
Numerator of the harmonic mean of the first n 9-gonal numbers.
Terms
- a(0) =1a(1) =9a(2) =216a(3) =6624a(4) =207000a(5) =9190800a(6) =825640200a(7) =16041009600a(8) =174445979400
External references
- oeis: A250548