n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 60 |
6 | 120 |
7 | 210 |
8 | 20496 |
9 | 181944 |
10 | 1059120 |
11 | 4990590 |
12 | 180292200 |
13 | 3191349876 |
14 | 36598884504 |
15 | 327837512730 |
16 | 7732754793120 |
17 | 194896185648240 |
18 | 3574721299186656 |
19 | 51311061420097014 |
20 | 1105883184455171640 |
21 | 32127696556638165420 |
22 | 812811279492629700360 |
[0,0,0,0,24,60,120,210,20496,181944,1059120, 4990590,180292200,3191349876,36598884504, 327837512730,7732754793120,194896185648240, 3574721299186656,51311061420097014, 1105883184455171640,32127696556638165420, 812811279492629700360] |