# A026890 (b-file synthesized from sequence entry)
3 1
4 9
5 56
6 301
7 1506
8 7258
9 34322
10 161039
11 755145
12 3556269
13 16876326
14 80881483
15 392014244
16 1922785012
17 9545380884
18 47947476888
19 243553779646
20 1250097073918
21 6477850149236
22 33857970839030
23 178339124650000
24 945852940569120