# A087598 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 6
5 10
6 21
7 28
8 36
9 45
10 55
11 66
12 78
13 171
14 465
15 528
16 666
17 2211
18 4465
19 22791
20 333336