G.f.: A(x) = (A_1)^3 where A_1 = 1/[1 - x*(A_2)^3], A_2 = 1/[1 - x^2*(A_3)^3], A_3 = 1/[1 - x^3*(A_4)^3], ... A_n = 1/[1 - x^n*(A_{n+1})^3] for n>=1.

A132335

G.f.: A(x) = (A_1)^3 where A_1 = 1/[1 - x*(A_2)^3], A_2 = 1/[1 - x^2*(A_3)^3], A_3 = 1/[1 - x^3*(A_4)^3], ... A_n = 1/[1 - x^n*(A_{n+1})^3] for n>=1.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =19a(4) =51a(5) =129a(6) =361a(7) =939a(8) =2433a(9) =6376a(10) =16362a(11) =41970a(12) =107206a(13) =271881a(14) =687999a(15) =1733695a(16) =4352877a(17) =10899381a(18) =27208492a(19) =67745649a(20) =168275466a(21) =417023747a(22) =1031321451a(23) =2545496316a(24) =6271166097a(25) =15423190770a(26) =37869769518a(27) =92842013185

External references