Riordan array (1/(1-9x)^(1/3), x/(9x-1)).

Terms

a(0) =1a(1) =3a(2) =-1a(3) =18a(4) =-12a(5) =1a(6) =126a(7) =-126a(8) =21a(9) =-1a(10) =945a(11) =-1260a(12) =315a(13) =-30a(14) =1a(15) =7371a(16) =-12285a(17) =4095a(18) =-585a(19) =39a(20) =-1a(21) =58968a(22) =-117936a(23) =49140a(24) =-9360a(25) =936a(26) =-48a(27) =1a(28) =480168a(29) =-1120392