Expansion of (1+6x-60x^2)/((1-6x)(1+6x)).

Terms

a(0) =1a(1) =6a(2) =-24a(3) =216a(4) =-864a(5) =7776a(6) =-31104a(7) =279936a(8) =-1119744a(9) =10077696a(10) =-40310784a(11) =362797056a(12) =-1451188224a(13) =13060694016a(14) =-52242776064a(15) =470184984576