# A028477 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 108
4 725
5 4480
6 28561
7 179928
8 1138660
9 7193450
10 45474461
11 287400960
12 1816564229
13 11481464878
14 72568802500
15 458669938608
16 2899021855801
17 18323243845760
18 115811947027949
19 731988596166300
20 4626528972901940
21 29241944603930518
22 184823511249946969