Expansion of 1/(Sum_{k>=0} x^(k^2))^2.

Terms

a(0) =1a(1) =-2a(2) =3a(3) =-4a(4) =3a(5) =0a(6) =-5a(7) =12a(8) =-18a(9) =18a(10) =-9a(11) =-12a(12) =44a(13) =-76a(14) =93a(15) =-76a(16) =5a(17) =120a(18) =-273a(19) =400a(20) =-414a(21) =228a(22) =200a(23) =-828a(24) =1480a(25) =-1842a(26) =1539a(27) =-268a(28) =-2004a(29) =4824