# A148655 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 24 5 64 6 234 7 773 8 2834 9 9831 10 36850 11 136350 12 513560 13 1943118 14 7518616 15 28941609 16 112624730 17 442163143 18 1745001882 19 6898346029 20 27491740152 21 109998293464 22 441017760936 23 1775880590304 24 7183972818702 25 29116762856767 26 118326172979525 27 482587819602284 28 1972390878751295