a(n) = 7-n.

Terms

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