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

Terms

a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =-4a(5) =-7a(6) =-6a(7) =3a(8) =21a(9) =40a(10) =40a(11) =-5a(12) =-106a(13) =-226a(14) =-256a(15) =-39a(16) =519a(17) =1257a(18) =1591a(19) =592a(20) =-2441a(21) =-6880a(22) =-9655a(23) =-5365a(24) =10836a(25) =37026a(26) =57411a(27) =41104a(28) =-43784a(29) =-195632