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

Terms

a(0) =1a(1) =5a(2) =22a(3) =98a(4) =451a(5) =2135a(6) =10312a(7) =50468a(8) =249061a(9) =1235465a(10) =6147802a(11) =30650438a(12) =152986471a(13) =764135195a(14) =3818284492a(15) =19084248008a(16) =95399716681a(17) =476934013325