# A124538 (b-file synthesized from sequence entry)
0 1
1 2
2 3
3 5
4 11
5 33
6 125
7 551
8 2695
9 14258
10 80343
11 477161
12 2964299
13 19155014
14 128203704
15 885830074
16 6302476880
17 46077527307
18 345590801495
19 2655466079629
20 20880388012659
21 167861200630015
22 1378589193074514
23 11558511053625488