a(n) = (1 + 1/2 + 1/3 + ... + 1/n)*(2n-1)!/(n-1)!.

A058607

a(n) = (1 + 1/2 + 1/3 + ... + 1/n)*(2n-1)!/(n-1)!.

Terms

    a(0) =1a(1) =9a(2) =110a(3) =1750a(4) =34524a(5) =814968a(6) =22424688a(7) =705173040a(8) =24956062560a(9) =981852505920

External references