Expansion of 1/((1-x)*(1-3*x)*(1-7*x)).

Terms

a(0) =1a(1) =11a(2) =90a(3) =670a(4) =4811a(5) =34041a(6) =239380a(7) =1678940a(8) =11762421a(9) =82366471a(10) =576653870a(11) =4036842810a(12) =28258696831a(13) =197813269301