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

Terms

a(0) =1a(1) =6a(2) =30a(3) =135a(4) =567a(5) =2268a(6) =8748a(7) =32805a(8) =120285a(9) =433026a(10) =1535274a(11) =5373459a(12) =18600435a(13) =63772920a(14) =216827928a(15) =731794257a(16) =2453663097a(17) =8178876990a(18) =27119434230a(19) =89494132959a(20) =294052151151a(21) =962352494676