# A026948 (b-file synthesized from sequence entry)
2 1
3 8
4 58
5 272
6 1770
7 7428
8 46928
9 189808
10 1185645
11 4724160
12 29362806
13 116207424
14 720606705
15 2842936320
16 17610412600
17 69378730880
18 429579843435
19 1691519468760
20 10472653252550
21 41235710124400
22 255326054688320
23 1005560117623204
24 6227515552731528
25 24534901740913872