Numerator of n^(n-1)/n!.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =125a(5) =54a(6) =16807a(7) =16384a(8) =531441a(9) =156250a(10) =2357947691a(11) =2985984a(13) =7909306972a(14) =320361328125