# A083330 (b-file synthesized from sequence entry)
0 1
1 4
2 17
3 73
4 311
5 1309
6 5447
7 22453
8 91871
9 373789
10 1514327
11 6115333
12 24636431
13 99073069
14 397878407
15 1596280213
16 6399436991
17 25640729149
18 102691925687
19 411154861093
20 1645781181551
21 6586610462029
22 26356900104167