# A026027 (b-file synthesized from sequence entry)
2 1
3 5
4 21
5 84
6 329
7 1274
8 4900
9 18768
10 71706
11 273581
12 1043119
13 3976700
14 15163785
15 57848910
16 220830360
17 843621600
18 3225477150
19 12342901410
20 47274639594
21 181230395304
22 695384769002
23 2670587146260
24 10265249568536
25 39491671919840