Nimsum n + 7.

Terms

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