# A163640 (b-file synthesized from sequence entry)
0 1
1 6
2 30
3 70
4 210
5 462
6 6006
7 4290
8 72930
9 461890
10 1939938
11 4056234
12 6760390
13 1560090
14 6463230
15 200360130
16 2203961430
17 907513530
18 33578000610
19 22974421470
20 941951280270