Expansion of (-1 + Product_{k>=1} (1 + x^k)^k)^9.

Terms

a(0) =1a(1) =18a(2) =189a(3) =1464a(4) =9252a(5) =50292a(6) =243117a(7) =1068939a(8) =4344660a(9) =16522967a(10) =59349627a(11) =202844007a(12) =663615180a(13) =2088375867a(14) =6347592999a(15) =18698498610a(16) =53538715836a(17) =149375490453a(18) =406987481852