# A022489 (b-file synthesized from sequence entry)
1 0
2 1
3 1
4 3
5 5
6 18
7 61
8 357
9 2330
10 18715
11 167783
12 1686327
13 18615873
14 224310263
15 2926679435
16 41112186396
17 618573033369
18 9924788849845
19 169150125371328
20 3051766556302719