Grundy function for turn-at-most-6-coins game.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =63a(7) =64a(8) =128a(9) =256a(10) =455a(11) =512a(12) =729a(13) =874a(14) =948a(15) =1024a(16) =1259a(17) =1393a(18) =1437a(19) =1660a(20) =1678a(21) =1831a(22) =2002a(23) =2048a(24) =4096a(25) =8192a(26) =14343a(27) =16384a(28) =22553a(29) =26666