# A009225 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 5
4 16
5 57
6 248
7 1157
8 6336
9 36753
10 244480
11 1702725
12 13409408
13 109438409
14 999327488
15 9375819525
16 97590304768
17 1036122313377
18 12120423043072
19 143739691502213
20 1867576863899648
21 24474485553698265