# A089429 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 10
5 26
6 74
7 218
8 672
9 2134
10 6964
11 23206
12 78724
13 271014
14 944766
15 3328872
16 11838378
17 42441326
18 153236900
19 556746772
20 2034098988