a(n) = n-10.

Terms

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