# A129653 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 15
4 83
5 556
6 4435
7 40773
8 423836
9 4908403
10 62606297
11 871421976
12 13136605577
13 213122669141
14 3701085673676
15 68480774296803
16 1344611320542931
17 27917413103561540
18 611000785570868627
19 14056645627856206809
20 339081826905338009620
21 8557085279980716462407