# A309903 (b-file synthesized from sequence entry)
0 0
1 1
2 21
3 71
4 196
5 2071
6 2071
7 33321
8 345821
9 736446
10 8548946
11 18314571
12 18314571
13 994877071
14 994877071
15 25408939571
16 86444095821
17 239031986446
18 1001971439571
19 16260760502071
20 92554705814571
21 283289569095821
22 1236963885502071
23 8389521258548946