# A180112 (b-file synthesized from sequence entry) 2 1 3 3 4 11 5 57 6 360 7 2428 8 19692 9 178096 10 1814400 11 19748160 12 237351468 13 3091307829 14 43589145600 15 650470873262 16 10415387654044 17 177171175431551 18 3201186852864000 19 60647963017860105 20 1213361365706836584 21 25488014447816087399 22 562000363888803840000