a(n) = n! * Sum_{k=1..n-1} H(k)*H(n-k) for n>=2, where H(n) is the n-th harmonic number.
A193446
a(n) = n! * Sum_{k=1..n-1} H(k)*H(n-k) for n>=2, where H(n) is the n-th harmonic number.
Terms
- a(0) =2a(1) =18a(2) =142a(3) =1160a(4) =10208a(5) =97720a(6) =1018008a(7) =11507472a(8) =140581872a(9) =1848236544a(10) =26041957632a(11) =391738883328
External references
- oeis: A193446