n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 720 |
7 | 12600 |
8 | 134400 |
9 | 1134000 |
10 | 8341200 |
11 | 56133000 |
12 | 355291200 |
13 | 2151864000 |
14 | 12614281680 |
15 | 72135063000 |
16 | 404672486400 |
17 | 2236228722000 |
18 | 12209943566160 |
19 | 66024457842600 |
20 | 354214283304000 |
21 | 1887999348060000 |
22 | 10008933180578640 |
23 | 52820388477271800 |
24 | 277680637970208000 |
[0,0,0,0,0,0,720,12600,134400,1134000,8341200, 56133000,355291200,2151864000,12614281680, 72135063000,404672486400,2236228722000, 12209943566160,66024457842600,354214283304000, 1887999348060000,10008933180578640, 52820388477271800,277680637970208000] |