# A208977 (b-file synthesized from sequence entry)
0 1
1 2
2 12
3 86
4 666
5 5388
6 44832
7 380424
8 3275172
9 28512248
10 250413856
11 2215112886
12 19711078686
13 176276723508
14 1583186541144
15 14271487891512
16 129063176166570
17 1170480053359908
18 10641805703955624
19 96970507481607972
20 885397365149468076
21 8098908925136867112