a(n) = 5-n.

Terms

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