Nimsum n + 6.

Terms

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