n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 42 |
6 | 264 |
7 | 1920 |
8 | 15840 |
9 | 146160 |
10 | 1491840 |
11 | 16692480 |
12 | 203212800 |
13 | 2674425600 |
14 | 37841126400 |
15 | 572885913600 |
16 | 9240898867200 |
17 | 158228598528000 |
18 | 2866422214656000 |
19 | 54775863926784000 |
20 | 1101208277385216000 |
21 | 23234214178086912000 |
22 | 513342323725271040000 |
[1,1,2,8,42,264,1920,15840,146160,1491840, 16692480,203212800,2674425600,37841126400, 572885913600,9240898867200,158228598528000, 2866422214656000,54775863926784000, 1101208277385216000,23234214178086912000, 513342323725271040000] |