Expansion of (1-6x)/(1-6x-5x^2).

Terms

a(0) =1a(1) =0a(2) =5a(3) =30a(4) =205a(5) =1380a(6) =9305a(7) =62730a(8) =422905a(9) =2851080a(10) =19221005a(11) =129581430a(12) =873593605a(13) =5889468780a(14) =39704780705a(15) =267676028130