# A118491 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 30
4 210
5 2310
6 30030
7 510510
8 9699690
9 223092870
10 6469693230
11 200560490130
12 7420738134810
13 304250263527210
14 14299762385778870
15 757887406446280110
16 44715356980330526490
17 2995928917682145274830