a(n) = n-4.

Terms

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