The odd numbers: a(n) = 2*n + 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =11a(6) =13a(7) =15a(8) =17a(9) =19a(10) =21a(11) =23a(12) =25a(13) =27a(14) =29a(15) =31a(16) =33a(17) =35a(18) =37a(19) =39a(20) =41a(21) =43a(22) =45a(23) =47a(24) =49a(25) =51a(26) =53a(27) =55a(28) =57a(29) =59