# A146923 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 6
9 12
10 19
11 29
12 56
13 159
14 456
15 1350
16 3940
17 11848
18 42451
19 167584
20 713562
21 3187201