a(n) = (-1)^(n+1) * n^n * (n + (1/12) * (n^2-1)).
A080291
a(n) = (-1)^(n+1) * n^n * (n + (1/12) * (n^2-1)).
Terms
- a(0) =1a(1) =-9a(2) =99a(3) =-1344a(4) =21875a(5) =-416016a(6) =9058973a(7) =-222298112a(8) =6069587661a(9) =-182500000000
External references
- oeis: A080291