Expansion of Product_{k>=1} 1/(1 + x^k)^(sigma_2(k)).

Terms

a(0) =1a(1) =-1a(2) =-4a(3) =-6a(4) =0a(5) =24a(6) =51a(7) =89a(8) =47a(9) =-152a(10) =-578a(11) =-1149a(12) =-1482a(13) =-738a(14) =2384a(15) =8901a(16) =18476a(17) =26774a(18) =24151a(19) =-7143a(20) =-86804a(21) =-226605a(22) =-406442a(23) =-539872a(24) =-441822a(25) =181268a(26) =1671148a(27) =4240334a(28) =7618777a(29) =10551340