a(n) = n-25.

Terms

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