n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 120 |
6 | 1800 |
7 | 21000 |
8 | 235200 |
9 | 2693880 |
10 | 32319000 |
11 | 410031600 |
12 | 5519487600 |
13 | 78864820320 |
14 | 1194924450720 |
15 | 19166592681600 |
16 | 324817601472000 |
17 | 5803921108010880 |
18 | 109115988701293440 |
19 | 2154085473710580480 |
20 | 44566174481427360000 |
21 | 964537418717406213120 |
22 | 21799797542483649131520 |
[0,0,0,0,0,120,1800,21000,235200,2693880,32319000, 410031600,5519487600,78864820320,1194924450720, 19166592681600,324817601472000,5803921108010880, 109115988701293440,2154085473710580480, 44566174481427360000,964537418717406213120, 21799797542483649131520] |