# A321717 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 8 4 39 5 122 6 950 7 5042 8 45594 9 366243 10 3858148 11 39916802 12 494852628 13 6227020802 14 88543569808 15 1308012219556 16 21086562956045 17 355687428096002 18 6427672041650478 19 121645100408832002