Expansion of ( 1+x^2 ) / ( 1-4*x+5*x^2-4*x^3 ).

Terms

a(0) =1a(1) =4a(2) =12a(3) =32a(4) =84a(5) =224a(6) =604a(7) =1632a(8) =4404a(9) =11872a(10) =31996a(11) =86240a(12) =232468a(13) =626656a(14) =1689244a(15) =4553568a(16) =12274676a(17) =33087840a(18) =89192252a(19) =240428512a(20) =648104148a(21) =1747043040a(22) =4709365468a(23) =12694663264a(24) =34219997876a(25) =92244137056a(26) =248655211900a(27) =670280153824