Expansion of Product_{i>0, j>0, k>0} (1 - x^(i^2 + j^2 + k^2)).

Terms

a(0) =1a(1) =0a(2) =0a(3) =-1a(4) =0a(5) =0a(6) =-3a(7) =0a(8) =0a(9) =0a(10) =0a(11) =-3a(12) =5a(13) =0a(14) =-3a(15) =7a(16) =0a(17) =12a(18) =-7a(19) =-3a(20) =21a(21) =-14a(22) =3a(23) =-6a(24) =6a(25) =27a(26) =-57a(27) =22a(28) =6a(29) =-36