# A138911 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 19
4 81
5 401
6 2233
7 13721
8 91969
9 666145
10 5174001
11 42827225
12 375850225
13 3481908353
14 33923685097
15 346468507201
16 3698848172289
17 41173895716289
18 476826776487649
19 5733422156706473
20 71449460236945201
21 921311262658989217