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

Terms

a(0) =1a(1) =2a(2) =7a(3) =20a(4) =60a(5) =178a(6) =529a(7) =1572a(8) =4671a(9) =13880a(10) =41244a(11) =122556a(12) =364173a(13) =1082134a(14) =3215543a(15) =9554932a(16) =28392320a(17) =84367302a(18) =250696021a(19) =744939016a(20) =2213573775a(21) =6577597296a(22) =19545219896a(23) =58078292664a(24) =172578671241a(25) =512814623178