a(n) = 30 - n.

Terms

a(0) =30a(1) =29a(2) =28a(3) =27a(4) =26a(5) =25a(6) =24a(7) =23a(8) =22a(9) =21a(10) =20a(11) =19a(12) =18a(13) =17a(14) =16a(15) =15a(16) =14a(17) =13a(18) =12a(19) =11a(20) =10a(21) =9a(22) =8a(23) =7a(24) =6a(25) =5a(26) =4a(27) =3a(28) =2a(29) =1