# A155639 (b-file synthesized from sequence entry)
0 1
1 2
2 12
3 92
4 672
5 4652
6 31032
7 201812
8 1288992
9 8124572
10 50700552
11 313968932
12 1932641712
13 11839990892
14 72260648472
15 439667406452
16 2668522016832
17 16163719991612
18 97745259402792
19 590286253682372
20 3560791008422352