G.f. A(x) satisfies: (1 + x) = A(x)*A(x^2)^2*A(x^3)^3*A(x^4)^4* ... *A(x^k)^k* ...

Terms

a(0) =1a(1) =1a(2) =-2a(3) =-5a(4) =0a(5) =4a(6) =9a(7) =2a(8) =-10a(9) =-21a(10) =29a(11) =15a(12) =-18a(13) =-80a(14) =50a(15) =59a(16) =207a(17) =-228a(18) =-244a(19) =-315a(20) =868a(21) =103a(22) =360a(23) =-1907a(24) =752a(25) =-151a(26) =3802a(27) =-5032a(28) =965a(29) =-5279