a(n) = Sum_{i=1..n} i*(n^(n-i-1) + n^(n+i-1)).
A068793
a(n) = Sum_{i=1..n} i*(n^(n-i-1) + n^(n+i-1)).
Terms
- a(0) =5a(1) =194a(2) =14619a(3) =1831444a(4) =348288905a(5) =94197694758
External references
- oeis: A068793
A068793
a(n) = Sum_{i=1..n} i*(n^(n-i-1) + n^(n+i-1)).