a(n) = n-31.

Terms

a(0) =-31a(1) =-30a(2) =-29a(3) =-28a(4) =-27a(5) =-26a(6) =-25a(7) =-24a(8) =-23a(9) =-22a(10) =-21a(11) =-20a(12) =-19a(13) =-18a(14) =-17a(15) =-16a(16) =-15a(17) =-14a(18) =-13a(19) =-12a(20) =-11a(21) =-10a(22) =-9a(23) =-8a(24) =-7a(25) =-6a(26) =-5a(27) =-4a(28) =-3a(29) =-2