# A377113 (b-file synthesized from sequence entry)
0 1
1 3
2 14
3 72
4 400
5 2328
6 13904
7 84192
8 513472
9 3143232
10 19278464
11 118359552
12 727045120
13 4467233280
14 27452300288
15 168714381312
16 1036914921472
17 6372994560000
18 39169586880512
19 240744913207296
20 1479676193996800
21 9094462273585152
22 55896907276156928