# A146533 (b-file synthesized from sequence entry)
0 1
1 7
2 21
3 70
4 245
5 882
6 3234
7 12012
8 45045
9 170170
10 646646
11 2469012
12 9464546
13 36402100
14 140408100
15 542911320
16 2103781365
17 8167621770
18 31762973550
19 123708423300
20 482462850870
21 1883902560540
22 7364346373020