# A047109 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 31
4 151
5 917
6 5619
7 33627
8 210911
9 1326395
10 8366161
11 53441835
12 342477957
13 2203613164
14 14248253995
15 92379163952
16 600644552471
17 3915699367751
18 25579440322831
19 167423682425912
20 1097738520430457
21 7208383257398805