# A104089 (b-file synthesized from sequence entry) 1 3 2 13 3 61 4 251 5 1021 6 4093 7 16381 8 65521 9 262139 10 1048573 11 4194301 12 16777213 13 67108859 14 268435399 15 1073741789 16 4294967291 17 17179869143 18 68719476731 19 274877906899 20 1099511627689 21 4398046511093 22 17592186044399 23 70368744177643