Expansion of (1-x-x^N)/((1-x)(1-x^2)(1-x^3)...(1-x^N)) for N = 3.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =-1a(6) =-1a(7) =-3a(8) =-3a(9) =-5a(10) =-6a(11) =-8a(12) =-9a(13) =-12a(14) =-13a(15) =-16a(16) =-18a(17) =-21a(18) =-23a(19) =-27a(20) =-29a(21) =-33a(22) =-36a(23) =-40a(24) =-43a(25) =-48a(26) =-51a(27) =-56a(28) =-60a(29) =-65