# A148688 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 22 5 69 6 232 7 812 8 2933 9 10868 10 41176 11 158896 12 622615 13 2473326 14 9941501 15 40377341 16 165508498 17 684061812 18 2848337029 19 11939734114 20 50355254586 21 213555500201 22 910306132464 23 3898496289411 24 16768128275099 25 72411805333357 26 313867404311122 27 1365162015516800 28 5956939958207184