# A091353 (b-file synthesized from sequence entry)
0 1
1 3
2 9
3 30
4 115
5 510
6 2602
7 15133
8 99367
9 729962
10 5949393
11 53392902
12 524077321
13 5592200388
14 64520858034
15 801031071955
16 10654883235991
17 151253483735767
18 2283450321888155
19 36544617881242655
20 618220383026770560