a(n) = Sum_{i=0..n} i^(n - i)*(n - i)^i.
A062817
a(n) = Sum_{i=0..n} i^(n - i)*(n - i)^i.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =22a(4) =152a(5) =1251a(6) =11980a(7) =130908a(8) =1607488a(9) =21915525a(10) =328477396a(11) =5368649634a(12) =95026828136
External references
- oeis: A062817