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

Terms

a(0) =1a(1) =-1a(2) =0a(3) =-1a(4) =3a(5) =-2a(6) =1a(7) =-5a(8) =8a(9) =-5a(10) =7a(11) =-18a(12) =21a(13) =-17a(14) =32a(15) =-57a(16) =59a(17) =-66a(18) =121a(19) =-173a(20) =184a(21) =-253a(22) =415a(23) =-530a(24) =621a(25) =-921a(26) =1360a(27) =-1681a(28) =2163a(29) =-3202