# A131786 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 104
4 592
5 3592
6 23212
7 158652
8 1141964
9 8621820
10 68063300
11 560324488
12 4799515756
13 42690098440
14 393605305676
15 3755794383536
16 37034899306132
17 376877989985712
18 3953002335087184
19 42686126230197500
20 474037727935110620