# A214768 (b-file synthesized from sequence entry) 0 1 1 2 2 18 3 180 4 1734 5 18300 6 270420 7 5151720 8 96203910 9 1565102844 10 22108977596 11 287976684088 12 3835267955036 13 55283720348664 14 804522994149032 15 10849701753955856 16 150403977728200774 17 3086256025416536700 18 91156710989444409004 19 2687925748932854737432