# A149867 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 13 4 40 5 134 6 467 7 1681 8 6230 9 23698 10 91781 11 361474 12 1444421 13 5838953 14 23855627 15 98385021 16 409057415 17 1713260510 18 7223645090 19 30637979060 20 130649823315 21 559905201444 22 2410332888720 23 10419393878406 24 45214717684925 25 196904962166692 26 860326758933089 27 3770559907597927 28 16572613244060271