# A204440 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 6
5 20
6 80
7 384
8 2016
9 12096
10 82080
11 597888
12 4783104
13 41886720
14 389145600
15 3891456000
16 41803776000
17 472283136000
18 5667397632000
19 72153317376000
20 959814696960000
21 13437405757440000
22 197840194965504000
23 3028176742219776000
24 48450827875516416000