# A125224 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 26
5 148
6 1016
7 7978
8 69453
9 657225
10 6670401
11 71920229
12 817945093
13 9758974790
14 121626871825
15 1577990961146
16 21252296024422
17 296427097326849
18 4273527067114321
19 63574838609892291
20 974520726668356856