# A149189 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 10 4 37 5 126 6 472 7 1765 8 6878 9 26812 10 107028 11 428929 12 1740321 13 7098405 14 29176482 15 120454790 16 500030927 17 2083449191 18 8715752041 19 36576288141 20 153968912861 21 649844829206 22 2749607363057 23 11659719519993 24 49545446311575 25 210926363580093 26 899529315714847 27 3842334024093159