a(n) = (n!)^3 * Sum_{k=1..n-1} 1/(k^3*(n-k)^2).
A304655
a(n) = (n!)^3 * Sum_{k=1..n-1} 1/(k^3*(n-k)^2).
Terms
- a(0) =0a(1) =0a(2) =8a(3) =81a(4) =2480a(5) =175000a(6) =23825904a(7) =5563712448
External references
- oeis: A304655
A304655
a(n) = (n!)^3 * Sum_{k=1..n-1} 1/(k^3*(n-k)^2).