# A007171 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 16
5 89
6 579
7 3989
8 28630
9 210865
10 1584308
11 12091902
12 93483120
13 730503054
14 5760438853
15 45780146521
16 366304396662
17 2948412461685
18 23857049238752
19 193944769559906
20 1583294537879106
21 12974430494985262
22 106685110047676402