Numerator of 3 * H(n,3,1), a generalized harmonic number. See A075135.

A074596

Numerator of 3 * H(n,3,1), a generalized harmonic number. See A075135.

Terms

    a(0) =3a(1) =15a(2) =117a(3) =627a(4) =8571a(5) =35649a(6) =699171a(7) =7898361a(8) =40404717a(9) =41219817a(10) =1300637127a(11) =22464584559a(12) =843217244283a(13) =854342788713

External references