Expansion of 1/((1+x)*(1+2*x)*(1-4*x)).

Terms

a(0) =1a(1) =1a(2) =11a(3) =29a(4) =147a(5) =525a(6) =2227a(7) =8653a(8) =35123a(9) =139469a(10) =559923a(11) =2235597a(12) =8950579a(13) =35785933a(14) =143176499a(15) =572640461a(16) =2290692915a(17) =9162509517a(18) =36650562355a(19) =146601200845a(20) =586406900531