# A104066 (b-file synthesized from sequence entry) 1 11 2 23 3 71 4 263 5 1031 6 65543 7 262151 8 1048583 9 268435463 10 1073741831 11 274877906951 12 17592186044423 13 302231454903657293676551 14 309485009821345068724781063 15 316912650057057350374175801351