a(n) = (n^(n+1) + n^(n-1))/2.

A062023

a(n) = (n^(n+1) + n^(n-1))/2.

Terms

    a(0) =1a(1) =5a(2) =45a(3) =544a(4) =8125a(5) =143856a(6) =2941225a(7) =68157440a(8) =1764915561a(9) =50500000000

External references