G.f.: A(x) = 1/(1 - x*B(x^3)), where B(x) = Sum_{n>=0} a(n)^3*x^n is the g.f. of A121652.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =4a(7) =6a(8) =9a(9) =13a(10) =19a(11) =28a(12) =41a(13) =67a(14) =102a(15) =150a(16) =243a(17) =378a(18) =568a(19) =895a(20) =1390a(21) =2115a(22) =3366a(23) =5229a(24) =7974a(25) =12687a(26) =19785a(27) =30307a(28) =47893a(29) =74761