# A137549 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 14 5 43 6 143 7 511 8 1950 9 7903 10 33848 11 152529 12 720466 13 3555715 14 18285538 15 97752779 16 542107657 17 3112916651 18 18477588573 19 113203102619 20 714836382820 21 4646688247467 22 31057662848411 23 213217403924667 24 1502038027665181