Expansion of (1+x)*(1+x+x^2)*(1-x+x^2-4*x+x^4-x^5+x^6)/(1+x^4)^3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-3a(4) =-9a(5) =-9a(6) =-6a(7) =10a(8) =25a(9) =25a(10) =15a(11) =-21a(12) =-49a(13) =-49a(14) =-28a(15) =36a(16) =81a(17) =81a(18) =45a(19) =-55a(20) =-121a(21) =-121a(22) =-66a(23) =78a(24) =169a(25) =169a(26) =91a(27) =-105a(28) =-225a(29) =-225