a(n) = n-9.

Terms

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