# A146448 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 1
5 3
6 7
7 15
8 49
9 233
10 1205
11 7091
12 56369
13 554977
14 6653663
15 98474615
16 1800719003
17 40485995917
18 1128941883627
19 39031781085873
20 1652786153476941