G.f. A(x) satisfies: (1 + x)/(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) =2a(2) =-2a(3) =-12a(4) =-10a(5) =12a(6) =44a(7) =40a(8) =-26a(9) =-132a(10) =-60a(11) =104a(12) =156a(13) =-152a(14) =-136a(15) =80a(16) =1030a(17) =204a(18) =-1548a(19) =-3736a(20) =1780a(21) =5096a(22) =7496a(23) =-8208a(24) =-9956a(25) =-11416a(26) =30824a(27) =2784a(28) =-296a(29) =-72768