# A177635 (b-file synthesized from sequence entry) 0 1 1 1 2 20 3 1680 4 369600 5 168168000 6 137225088000 7 182499151015439 8 369333660414653745 9 1080107104118231632500 10 4384231121059173932562000 11 23913914175434871142808715000 12 170693577054027116430454774306800 13 1559452501977701854639515593122328400