# A047048 (b-file synthesized from sequence entry)
0 1
1 4
2 14
3 48
4 165
5 586
6 2114
7 7694
8 28173
9 104370
10 389751
11 1463288
12 5514820
13 20894454
14 79510118
15 303570094
16 1161991698
17 4460728710
18 17168879077
19 66225380848
20 255907081225
21 990671100502
22 3841609763148
23 14919279265464