# A224530 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 6
4 30
5 144
6 758
7 4080
8 22702
9 128832
10 744300
11 4359972
12 25842414
13 154689912
14 933828324
15 5678696556
16 34754244174
17 213901762464
18 1323104558204
19 8220846355956
20 51284447272084
21 321095305733280
22 2017050339848388
23 12708912192988128
24 80296949632284814
25 508618518515268720