# A262977 (b-file synthesized from sequence entry) 0 1 1 3 2 21 3 165 4 1365 5 11628 6 100947 7 888030 8 7888725 9 70607460 10 635745396 11 5752004349 12 52251400851 13 476260169700 14 4353548972850 15 39895566894540 16 366395202809685 17 3371363686069236 18 31074067324187580 19 286845713747883300 20 2651487106659130740 21 24539426037817994160