L.g.f.: log( Sum_{k>=0} x^(k^4) ).

Terms

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