# A153397 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 43
4 334
5 2717
6 22776
7 195000
8 1695874
9 14927990
10 132673398
11 1188412986
12 10714602196
13 97133633788
14 884716464592
15 8091061578807
16 74259516900390
17 683694381314696
18 6312247839166260
19 58424001667319720
20 541971167468786770