# A155850 (b-file synthesized from sequence entry) 1 2 2 4 3 3 4 5 5 7 6 15 7 17 8 31 9 65 10 129 11 127 12 449 13 511 14 2561 15 1025 16 7937 17 12799 18 20481 19 8191 20 28673 21 65537 22 131071 23 458751 24 360449 25 966655 26 524287 27 4194303 28 2097151 29 29360129 30 34865153 31 67108865 32 134217729 33 33554431 34 608174081 35 268435457 36 536870911 37 4831838207