# A230553 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 10
5 24
6 62
7 156
8 406
9 1040
10 2714
11 7012
12 18322
13 47560
14 124358
15 323708
16 846766
17 2208032
18 5777330
19 15082372
20 39469786