# A180111 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 13
5 63
6 360
7 2612
8 20628
9 184784
10 1814400
11 20168640
12 241650132
13 3135712971
14 43589145600
15 657203494738
16 10507402233956
17 178516252664449
18 3201186852864000
19 60997137390971895
20 1219540642469803416
21 25602927723893352601
22 562000363888803840000