a(n) = (n^(n+1))*(n + 1)/2 = A000217(n)*A000312(n).
A109391
a(n) = (n^(n+1))*(n + 1)/2 = A000217(n)*A000312(n).
Terms
- a(0) =0a(1) =1a(2) =12a(3) =162a(4) =2560a(5) =46875a(6) =979776a(7) =23059204a(8) =603979776a(9) =17433922005a(10) =550000000000
External references
- oeis: A109391