Nimsum n + 18.

Terms

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