n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 24 |
5 | 300 |
6 | 4480 |
7 | 78750 |
8 | 1591296 |
9 | 36355256 |
10 | 927244800 |
11 | 26127386010 |
12 | 806251494400 |
13 | 27046291980708 |
14 | 980094896062464 |
15 | 38158333538165750 |
16 | 1588601646620835840 |
17 | 70427042234715548400 |
18 | 3312574102411273437184 |
19 | 164767312911755127462066 |
20 | 8641342923227371929600000 |
[1,0,0,2,24,300,4480,78750,1591296,36355256, 927244800,26127386010,806251494400,27046291980708, 980094896062464,38158333538165750, 1588601646620835840,70427042234715548400, 3312574102411273437184,164767312911755127462066, 8641342923227371929600000] |