a(n) = n! * Sum_{k|n} (Sum_{j=1..k} 1/j); the k-sum is over the positive divisors, k, of n.
A067710
a(n) = n! * Sum_{k|n} (Sum_{j=1..k} 1/j); the k-sum is over the positive divisors, k, of n.
Terms
- a(0) =1a(1) =5a(2) =17a(3) =110a(4) =394a(5) =4884a(6) =18108a(7) =294384a(8) =2054736a(9) =27986400a(10) =160460640a(11) =5733590400a(12) =26029779840a(13) =727452230400
External references
- oeis: A067710