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

Terms

a(0) =1a(1) =1a(2) =-3a(3) =-7a(4) =5a(5) =33a(6) =13a(7) =-119a(8) =-171a(9) =305a(10) =989a(11) =-231a(12) =-4187a(13) =-3263a(14) =13485a(15) =26537a(16) =-27403a(17) =-133551a(18) =-23939a(19) =510265a(20) =606021a(21) =-1435039a(22) =-3859123a(23) =1881033a(24) =17317525a(25) =9793393a(26) =-59476707a(27) =-98650279a(28) =139256549a(29) =533857665