User blog comment:Alejandro Magno/g function/@comment-5029411-20140919212201/@comment-25371339-20140919233214

Even faster!

g_0(n) = G(G(G(...(G(G(64)))...))) w/ n levels (using the graham function)

g_1(0) = g_0(g_0(G(64)))

g_1(n) = g_0(g_1(n-1))