# A030831 (b-file synthesized from sequence entry)
1 2
2 4
3 12
4 51
5 259
6 1559
7 10914
8 87319
9 785876
10 7858763
11 86446399
12 1037356791
13 13485638291
14 188798936078
15 2831984041181
16 45311744658906
17 770299659201402
18 13865393865625240
19 263442483446879561
20 5268849668937591230