Nimsum n + 13.

Terms

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