# A119697 (b-file synthesized from sequence entry) 0 0 1 1 2 4 3 30 4 168 5 1050 6 6336 7 39039 8 240240 9 1487772 10 9237800 11 57551494 12 359444736 13 2250244100 14 14115694320 15 88707831750 16 558368324640 17 3519726403710 18 22215931214400 19 140389620550410 20 888125492826000 21 5623962934819320 22 35645449061816880 23 226114365012465150