a(0) = 1; a(n) = n! * Sum_{k=1..n} binomial(n-1,k-1) * (k-1)! * H(k) * a(n-k) / (n-k)!, where H(k) is the k-th harmonic number.

A336289

a(0) = 1; a(n) = n! * Sum_{k=1..n} binomial(n-1,k-1) * (k-1)! * H(k) * a(n-k) / (n-k)!, where H(k) is the k-th harmonic number.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =55a(4) =1054a(5) =31046a(6) =1299386a(7) =73211510a(8) =5338080280a(9) =488727800664

External references