Expansion of (1-x)*(1-2*x)*(1-3*x)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

Terms

a(0) =1a(1) =3a(2) =10a(3) =35a(4) =125a(5) =451a(6) =1637a(7) =5965a(8) =21794a(9) =79781a(10) =292468a(11) =1073296a(12) =3941950a(13) =14486721a(14) =53264010a(15) =195909180a(16) =720769621a(17) =2652351034a(18) =9761957789a(19) =35933354194a(20) =132282020709a(21) =487008295675