# A147171 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 193
10 369
11 2595
12 6071
13 68113
14 166829
15 3392025
16 10054713
17 1656174053
18 6422563367
19 1047960128407
20 4842120420549
21 791850842457727