Sprague-Grundy value for Grundy's game when starting with n tokens.

Terms

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