n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 240 |
6 | 1560 |
7 | 8400 |
8 | 40800 |
9 | 186480 |
10 | 818280 |
11 | 3498000 |
12 | 14674440 |
13 | 60780720 |
14 | 249393480 |
15 | 1016542560 |
16 | 4123132800 |
17 | 16664094960 |
18 | 67171179600 |
19 | 270232006800 |
20 | 1085569963080 |
21 | 4356217672800 |
22 | 17466683473800 |
[0,0,0,24,240,1560,8400,40800,186480,818280, 3498000,14674440,60780720,249393480,1016542560, 4123132800,16664094960,67171179600,270232006800, 1085569963080,4356217672800,17466683473800] |