Expansion of 1/(1 - 9*x/(1 + x)^2)^(1/3).

Terms

a(0) =1a(1) =3a(2) =12a(3) =63a(4) =357a(5) =2112a(6) =12834a(7) =79446a(8) =498504a(9) =3160566a(10) =20202882a(11) =129998400a(12) =841084065a(13) =5466859635a(14) =35672889180a(15) =233564188167