Numerator of the harmonic mean of the first n 10-gonal numbers.

A250550

Numerator of the harmonic mean of the first n 10-gonal numbers.

Terms

    a(0) =1a(1) =20a(2) =810a(3) =28080a(4) =596700a(5) =5012280a(6) =29238300a(7) =1938081600a(8) =7994586600a(9) =328666338000

External references