Expansion of (1-3x)/((1-x)(1-4x)(1-5x)).

Terms

a(0) =1a(1) =7a(2) =41a(3) =227a(4) =1221a(5) =6447a(6) =33601a(7) =173467a(8) =889181a(9) =4533287a(10) =23015961a(11) =116477907a(12) =587981941a(13) =2962279327a(14) =14900875121a(15) =74862289547a(16) =375743103501