# A052751 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 19
4 107
5 647
6 4167
7 27847
8 191747
9 1349743
10 9671316
11 70297105
12 517079157
13 3841701488
14 28787546360
15 217317367487
16 1651144126659
17 12616570941114
18 96891439504019
19 747452640586114
20 5789461514134881