# A030898 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 26
5 134
6 809
7 5669
8 45353
9 408184
10 4081844
11 44900294
12 538803530
13 7004445892
14 98062242500
15 1470933637503
16 23534938200055
17 400093949400940
18 7201691089216926
19 136832130695121608
20 2736642613902432167