Euler transform of negative integers.

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =-1a(4) =0a(5) =4a(6) =4a(7) =7a(8) =3a(9) =-2a(10) =-9a(11) =-17a(12) =-25a(13) =-24a(14) =-13a(15) =-1a(16) =32a(17) =61a(18) =97a(19) =111a(20) =112a(21) =74a(22) =8a(23) =-108a(24) =-243a(25) =-392a(26) =-512a(27) =-569a(28) =-542a(29) =-358