# A007857 (b-file synthesized from sequence entry)
1 1
2 2
3 8
4 37
5 184
6 959
7 5172
8 28641
9 162008
10 932503
11 5445934
12 32197334
13 192357788
14 1159603592
15 7045356104
16 43098733353
17 265240985112
18 1641100253735
19 10202295895890
20 63696629668980
21 399216722146770
22 2510833297584165