G.f. satisfies A(x) = 1 + x * A(x * (1 - x^3)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =0a(6) =-2a(7) =-5a(8) =-9a(9) =-8a(10) =7a(11) =48a(12) =120a(13) =161a(14) =-18a(15) =-798a(16) =-2486a(17) =-4088a(18) =-692a(19) =19840a(20) =71159a(21) =130467a(22) =31737a(23) =-688014a(24) =-2644266a(25) =-5066453a(26) =-866551a(27) =31217375a(28) =121457519a(29) =231494879