a(n) = 25-n.

Terms

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