# A043851 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 5 5 10 6 15 7 21 8 42 9 63 10 85 11 170 12 255 13 341 14 682 15 1023 16 1365 17 2730 18 4095 19 5461 20 10922 21 16383 22 21845 23 43690 24 65535 25 69905 26 69906 27 69907 28 69912 29 69913 30 69915 31 69916 32 69917 33 69918 34 69921 35 69922 36 69923 37 69924 38 69926 39 69927