a(n) = (n-1)*n^(n-2) + Sum_{i=1..n} (n-i)*(n^(n-i-1) + n^(n+i-3)).
A068792
a(n) = (n-1)*n^(n-2) + Sum_{i=1..n} (n-i)*(n^(n-i-1) + n^(n+i-3)).
Terms
- a(0) =1a(1) =16a(2) =441a(3) =24336a(4) =2418025a(5) =384473664a(6) =89755965649
External references
- oeis: A068792