n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 240 |
6 | 2040 |
7 | 17640 |
8 | 162456 |
9 | 1614816 |
10 | 17368320 |
11 | 201828000 |
12 | 2526193824 |
13 | 33936357312 |
14 | 487530074304 |
15 | 7463742249600 |
16 | 121367896891776 |
17 | 2089865973021696 |
18 | 37999535417459712 |
19 | 727710096185266176 |
20 | 14642785817771802624 |
21 | 308902349883623731200 |
22 | 6818239581643475251200 |
[0,0,0,0,24,240,2040,17640,162456,1614816, 17368320,201828000,2526193824,33936357312, 487530074304,7463742249600,121367896891776, 2089865973021696,37999535417459712, 727710096185266176,14642785817771802624, 308902349883623731200,6818239581643475251200] |