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

Terms

a(0) =1a(1) =-1a(2) =5a(3) =-14a(4) =36a(5) =-97a(6) =246a(7) =-593a(8) =1423a(9) =-3351a(10) =7699a(11) =-17432a(12) =38901a(13) =-85545a(14) =185862a(15) =-399220a(16) =848080a(17) =-1783682a(18) =3716584a(19) =-7675916a(20) =15722127a(21) =-31951330a(22) =64452707a(23) =-129102947a(24) =256876062a(25) =-507854808a(26) =997954125a(27) =-1949631802a(28) =3787674152a(29) =-7319306458