a(n) = n-2.

Terms

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