a(n) = 6-n.

Terms

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