a(n) = n! * Sum_{k=1..n} H(k)*(n+1-k)!, where H(k) = Sum_{j=1..k} 1/j.
A109779
a(n) = n! * Sum_{k=1..n} H(k)*(n+1-k)!, where H(k) = Sum_{j=1..k} 1/j.
Terms
- a(0) =1a(1) =7a(2) =65a(3) =930a(4) =20814a(5) =693732a(6) =32312412a(7) =1996944912a(8) =157655618928
External references
- oeis: A109779