Tersum n + 18.

Terms

a(0) =18a(1) =19a(2) =20a(3) =21a(4) =22a(5) =23a(6) =24a(7) =25a(8) =26a(9) =0a(10) =1a(11) =2a(12) =3a(13) =4a(14) =5a(15) =6a(16) =7a(17) =8a(18) =9a(19) =10a(20) =11a(21) =12a(22) =13a(23) =14a(24) =15a(25) =16a(26) =17a(27) =45a(28) =46a(29) =47