# A027315 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 20
4 90
5 692
6 5774
7 48924
8 417440
9 3580036
10 30831756
11 266463804
12 2309848194
13 20074999500
14 174867895438
15 1526259877412
16 13344806416950
17 116863477094660
18 1024844657752730
19 8998915251701628
20 79108591391227406
21 696167664755023388
22 6132277201334483178