The real part of b(n) where b(n) = (n + b(n-1)) * (1 + i) with b(-1)=0; i = sqrt(-1).

Terms

a(0) =0a(1) =1a(2) =2a(3) =1a(4) =-4a(5) =-13a(6) =-22a(7) =-23a(8) =-8a(9) =23a(10) =54a(11) =53a(12) =-12a(13) =-141a(14) =-270a(15) =-271a(16) =-16a(17) =495a(18) =1006a(19) =1005a(20) =-20a(21) =-2069a(22) =-4118a(23) =-4119a(24) =-24a(25) =8167a(26) =16358a(27) =16357a(28) =-28a(29) =-32797