a(n) = 1 - n.

Terms

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