n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 48 |
5 | 300 |
6 | 120 |
7 | 980 |
8 | 2240 |
9 | 22680 |
10 | 25200 |
11 | 304920 |
12 | 332640 |
13 | 4684680 |
14 | 5045040 |
15 | 5405400 |
16 | 11531520 |
17 | 208288080 |
18 | 73513440 |
19 | 1474352880 |
20 | 62078016 |
21 | 108636528 |
22 | 113809696 |
23 | 2736605872 |
24 | 8566766208 |
25 | 223092870000 |
26 | 232016584800 |
[1,4,18,48,300,120,980,2240,22680,25200,304920, 332640,4684680,5045040,5405400,11531520,208288080, 73513440,1474352880,62078016,108636528,113809696, 2736605872,8566766208,223092870000,232016584800] |