Numerator of the harmonic mean of the first n octagonal numbers.

A250400

Numerator of the harmonic mean of the first n octagonal numbers.

Terms

    a(0) =1a(1) =16a(2) =504a(3) =1680a(4) =27300a(5) =87360a(6) =1936480a(7) =24344320a(8) =1232431200a(9) =1369368000a(10) =46695448800a(11) =865988323200

External references