G.f. satisfies A(x) = Sum_{n>=1} A(x^3)^n / A(x^(2*n)), with A(0) = 0 and A'(0) = 1.

Terms

a(0) =1a(1) =1a(2) =0a(3) =2a(4) =4a(5) =2a(6) =2a(7) =8a(8) =8a(9) =14a(10) =22a(11) =26a(12) =53a(13) =70a(14) =89a(15) =149a(16) =220a(17) =291a(18) =441a(19) =674a(20) =926a(21) =1411a(22) =2030a(23) =2870a(24) =4399a(25) =6293a(26) =8928a(27) =13395a(28) =19487a(29) =27757