# A354737 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 20
5 80
6 336
7 1568
8 7584
9 39312
10 210080
11 1180256
12 6813312
13 40890304
14 251528704
15 1597332480
16 10376040448
17 69259146752
18 472084038144
19 3295588345344
20 23459477468160
21 170610216311808
22 1263629972183040
23 9543419750909952
24 73322350509367296
25 573544008429363200