a(n) = 26-n.

Terms

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