# A174276 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 30
4 70
5 210
6 2310
7 10010
8 6006
9 510510
10 461890
11 9699690
12 31870410
13 74364290
14 223092870
15 6469693230
16 6077590610
17 200560490130
18 200560490130
19 494715875654
20 674612557710
21 60850052705442
22 872184088778002
23 13082761331670030