a(n) = 24-n.

Terms

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