Grundy function for turn-at-most-4-coins game.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =16a(6) =32a(7) =51a(8) =64a(9) =85a(10) =106a(11) =128a(12) =150a(13) =171a(14) =219a(15) =237a(16) =247a(17) =256a(18) =279a(19) =297a(20) =455a(21) =512a(22) =537a(23) =557a(24) =594a(25) =643a(26) =803a(27) =863a(28) =998a(29) =1024