# A307975 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 6 4 17 5 52 6 161 7 524 8 1739 9 5929 10 20562 11 72471 12 258596 13 932897 14 3395922 15 12459900 16 46028216 17 171056252 18 639072199 19 2398886256 20 9042816457 21 34217811625 22 129926976921 23 494892472911 24 1890469032715 25 7240573075556 26 27799085344845 27 106970043377619 28 412474047216418