Expansion of 1 + (1/(1-x) + 1/(1-3*x))*x/2 + (1/(1-x) - 8/(1-2*x) + 9/(1-3*x))*x^5/2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =128a(7) =390a(8) =1184a(9) =3582a(10) =10808a(11) =32550a(12) =97904a(13) =294222a(14) =883688a(15) =2653110a(16) =7963424a(17) =23898462a(18) =71711768a(19) =215168070a(20) =645569744a(21) =1936840302a(22) =5810783048a(23) =17432873430a(24) =52299668864a(25) =156901103742a(26) =470707505528