# A374511 (b-file synthesized from sequence entry) 0 1 1 10 2 80 3 560 4 3640 5 22512 6 134400 7 781440 8 4451040 9 24939200 10 137865728 11 753625600 12 4080643840 13 21916106240 14 116877312000 15 619457482752 16 3265293719040 17 17128725519360 18 89462514606080 19 465434423336960 20 2412895587536896 21 12468681310412800 22 64242981906022400