Tersum n + 4.

Terms

a(0) =4a(1) =5a(2) =3a(3) =7a(4) =8a(5) =6a(6) =1a(7) =2a(8) =0a(9) =13a(10) =14a(11) =12a(12) =16a(13) =17a(14) =15a(15) =10a(16) =11a(17) =9a(18) =22a(19) =23a(20) =21a(21) =25a(22) =26a(23) =24a(24) =19a(25) =20a(26) =18a(27) =31a(28) =32a(29) =30