Expansion of g.f. A(x) satisfying A(x)^3 = A( x^3/(1 - 3*x)^3 ).

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =93a(5) =333a(6) =1271a(7) =5064a(8) =20673a(9) =85460a(10) =355659a(11) =1486719a(12) =6238608a(13) =26278281a(14) =111114558a(15) =471608944a(16) =2008906581a(17) =8586410085a(18) =36816550550a(19) =158332335279a(20) =682843960665