# A202668 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 12
4 42
5 158
6 618
7 2498
8 10360
9 43832
10 188420
11 820608
12 3613212
13 16057640
14 71933768
15 324482500
16 1472604586
17 6719100254
18 30804229858
19 141829955338
20 655541387406
21 3040527731790
22 14147444737654
23 66018910398574
24 308898542610666
25 1448867831911170