G.f.: Sum_{n>=0} (x^(n+1) + i)^n / (1 + i*x^n)^(n+1), in which the constant term is taken to be 1.

Terms

a(0) =1a(1) =2a(2) =1a(3) =-8a(4) =0a(5) =18a(6) =11a(7) =-16a(8) =-44a(9) =0a(10) =36a(11) =-12a(12) =35a(13) =112a(14) =56a(15) =-144a(16) =-260a(17) =-88a(18) =48a(19) =-20a(20) =95a(21) =504a(22) =636a(23) =288a(24) =-578a(25) =-1016a(26) =-292a(27) =-216a(28) =-624a(29) =-210