# A304200 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 6 5 18 6 58 7 186 8 570 9 1680 10 4878 11 14058 12 40200 13 114450 14 325290 15 923846 16 2624730 17 7465410 18 21261828 19 60647370 20 173288724 21 496014934 22 1422223506 23 4084793082 24 11751102060 25 33857989968 26 97697014590 27 282295318536 28 816759712080 29 2366027865810 30 6861964439314