a(n) = n-38.

Terms

a(0) =-38a(1) =-37a(2) =-36a(3) =-35a(4) =-34a(5) =-33a(6) =-32a(7) =-31a(8) =-30a(9) =-29a(10) =-28a(11) =-27a(12) =-26a(13) =-25a(14) =-24a(15) =-23a(16) =-22a(17) =-21a(18) =-20a(19) =-19a(20) =-18a(21) =-17a(22) =-16a(23) =-15a(24) =-14a(25) =-13a(26) =-12a(27) =-11a(28) =-10a(29) =-9