# A124390 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 4 4 7 5 12 6 23 7 46 8 97 9 212 10 481 11 1124 12 2705 13 6682 14 16919 15 43840 16 116087 17 313764 18 864683 19 2427306 20 6934769 21 20148124 22 59486997 23 178364624 24 542790609 25 1675526482 26 5243746235 27 16630136364 28 53422028679 29 173754047228