# A163824 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 24 5 106 6 470 7 2038 8 8624 9 35754 10 145902 11 588358 12 2351910 13 9341814 14 36936146 15 145567966 16 572415344 17 2247578314 18 8816986046 19 34570684966 20 135522530174 21 531285354214 22 2083180354466 23 8170672802686 24 32059325714054 25 125845764142006 26 494223989283650