Expansion of Product_{k>=1} (1 - x^k)^(k*(k+1)*(k+2)/6).

Terms

a(0) =1a(1) =-1a(2) =-4a(3) =-6a(4) =-4a(5) =19a(6) =60a(7) =131a(8) =149a(9) =-4a(10) =-572a(11) =-1764a(12) =-3485a(13) =-4716a(14) =-2658a(15) =7606a(16) =32944a(17) =77152a(18) =132586a(19) =161275a(20) =75150a(21) =-281687a(22) =-1111029a(23) =-2560293a(24) =-4470415a(25) =-5922117a(26) =-4603551a(27) =3799070a(28) =25573251a(29) =67259095