Tersum n + 13.

Terms

a(0) =13a(1) =14a(2) =12a(3) =16a(4) =17a(5) =15a(6) =10a(7) =11a(8) =9a(9) =22a(10) =23a(11) =21a(12) =25a(13) =26a(14) =24a(15) =19a(16) =20a(17) =18a(18) =4a(19) =5a(20) =3a(21) =7a(22) =8a(23) =6a(24) =1a(25) =2a(26) =0a(27) =40a(28) =41a(29) =39