# A113860 (b-file synthesized from sequence entry)
0 1
1 3
2 7
3 23
4 87
5 599
6 1623
7 3671
8 7767
9 15959
10 81495
11 343639
12 867927
13 1916503
14 18693719
15 152911447
16 421346903
17 958217815
18 2031959639
19 4179443287
20 12769377879
21 1112281005655
22 9908374027863
23 27500560072279
24 97869304249943