# A371548 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 16
4 44
5 248
6 2136
7 13536
8 116448
9 1075392
10 13066560
11 136385280
12 1811975040
13 23777683200
14 354509003520
15 5632664970240
16 93712140103680
17 1631567291719680
18 30968760551178240
19 605247894280028160
20 12515132360676556800
21 274444506310599475200