# A055488 (b-file synthesized from sequence entry)
3 5
4 14
5 54
6 264
7 1560
8 10920
9 97440
10 876960
11 10263240
12 112895640
13 1348827480
14 18029171160
15 264370186080
16 3806158356000
17 62703141621120
18 1128159304272000
19 20422064875212000
20 404757215566704000
21 8208550091549808000
22 177650747421074928000