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

Terms

a(0) =1a(1) =7a(2) =32a(3) =122a(4) =423a(5) =1389a(6) =4414a(7) =13744a(8) =42245a(9) =128771a(10) =390396a(11) =1179366a(12) =3554467a(13) =10696153a(14) =32153978a(15) =96592988a(16) =290041089a(17) =870647535a(18) =2612991160a(19) =7841070610a(20) =23527406111a(21) =70590606917a(22) =211788597942a(23) =635399348232