# A064621 (b-file synthesized from sequence entry)
1 1
2 3
3 6
4 13
5 20
6 62
7 113
8 224
9 367
10 494
11 833
12 9169
13 131313
14 155719
15 180118
16 280766754
17 3454917187
18 31685027464
19 152431947617
20 629621648241