# A125857 (b-file synthesized from sequence entry) 1 0 2 2 3 20 4 182 5 1640 6 14762 7 132860 8 1195742 9 10761680 10 96855122 11 871696100 12 7845264902 13 70607384120 14 635466457082 15 5719198113740 16 51472783023662 17 463255047212960 18 4169295424916642 19 37523658824249780 20 337712929418248022