a(n) = Sum_{k=1..floor(n/2)} H_k * (n-k)!, where H_k = Sum_{j=1..k} 1/j.
A109719
a(n) = Sum_{k=1..floor(n/2)} H_k * (n-k)!, where H_k = Sum_{j=1..k} 1/j.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =9a(4) =33a(5) =167a(6) =944a(7) =6390a(8) =49450a(9) =434374a(10) =4259184a(11) =46122552a(12) =546390012a(13) =7027204428a(14) =97489431360
External references
- oeis: A109719