Expansion of (1+4x)/(1+4x+5x^2).

Terms

a(0) =1a(1) =0a(2) =-5a(3) =20a(4) =-55a(5) =120a(6) =-205a(7) =220a(8) =145a(9) =-1680a(10) =5995a(11) =-15580a(12) =32345a(13) =-51480a(14) =44195a(15) =80620a(16) =-543455a(17) =1770720a(18) =-4365605a(19) =8608820a(20) =-12607255a(21) =7384920a(22) =33496595a(23) =-170910980a(24) =516160945a(25) =-1210088880a(26) =2259550795a(27) =-2987758780a(28) =653281145a(29) =12325669320