Nimsum n + 11.

Terms

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