Nimsum n + 19.

Terms

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