# A068842 (b-file synthesized from sequence entry) 0 11 1 23 2 41 3 83 4 163 5 3203 6 641 7 1283 8 25601 9 51203 10 10243 11 20483 12 40961 13 81929 14 163841 15 327689 16 6553621 17 1310723 18 2621447 19 5242883 20 10485767 21 20971529 22 41943049 23 838860817 24 167772161 25 335544323 26 6710886407 27 1342177283