G.f. satisfies A(x) = exp( Sum_{k>=1} (2 * (-1)^k + A(x^k)) * x^k/k ).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =0a(5) =0a(6) =1a(7) =0a(8) =0a(9) =1a(10) =1a(11) =0a(12) =1a(13) =2a(14) =2a(15) =1a(16) =3a(17) =5a(18) =4a(19) =4a(20) =10a(21) =13a(22) =11a(23) =16a(24) =30a(25) =34a(26) =35a(27) =58a(28) =91a(29) =99