# A177690 (b-file synthesized from sequence entry) 0 1 1 1 2 12 3 6 4 120 5 120 6 280 7 140 8 5040 9 5040 10 55440 11 55440 12 720720 13 720720 14 720720 15 360360 16 24504480 17 24504480 18 155195040 19 155195040 20 31039008 21 10346336 22 237965728 23 713897184 24 17847429600 25 17847429600 26 160626866400 27 22946695200