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

Terms

a(0) =1a(1) =3a(2) =0a(3) =-14a(4) =13a(5) =22a(6) =0a(7) =-30a(8) =-82a(9) =101a(10) =0a(11) =-46a(12) =170a(13) =54a(14) =0a(15) =-524a(16) =31a(17) =70a(18) =0a(19) =-78a(20) =442a(21) =1236a(22) =0a(23) =-94a(24) =-3204a(25) =1785a(26) =0a(27) =-2428a(28) =842a(29) =118