# A089874 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 3
5 5
6 6
7 18
8 45
9 147
10 147
11 267
12 801
13 2538
14 3255
15 7665
16 29484
17 67644
18 164088
19 515592
20 1657785