# A168653 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 21
5 82
6 340
7 1478
8 6622
9 30433
10 142331
11 676203
12 3248579
13 15776459
14 77196573
15 380849394
16 1888606247
17 9430534212
18 47236684433
19 238214461960
20 1202007809362
21 6116704517639
22 30997312336216
23 159384351652358