# A153399 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 45
4 371
5 3225
6 29007
7 267239
8 2506605
9 23842644
10 229369064
11 2227345899
12 21801617643
13 214862158025
14 2130226863222
15 21231722675274
16 212613977684254
17 2138164077605865
18 21585420400120710
19 218677042735538547