# A137664 (b-file synthesized from sequence entry) 1 8 2 63 3 7775 4 2097151 5 743008370687 6 793714773254143 7 2185911559738696531967 8 5242879999999999999999999 9 55572324035428505185378394701823 10 6863037736488299999999999999999999999999999