a(n) = (b(p)-2)/p where b(k) denotes Bell numbers and p = prime(n).

A079609

a(n) = (b(p)-2)/p where b(k) denotes Bell numbers and p = prime(n).

Terms

    a(0) =0a(1) =1a(2) =10a(3) =125a(4) =61688a(5) =2126495a(6) =4874404106a(7) =306986431845

External references