n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 6 |
3 | 6 |
4 | 90 |
5 | 180 |
6 | 1770 |
7 | 5040 |
8 | 39690 |
9 | 140280 |
10 | 964656 |
11 | 3922380 |
12 | 24755346 |
13 | 110486376 |
14 | 660153780 |
15 | 3137330196 |
16 | 18103340970 |
17 | 89794566576 |
18 | 506892467796 |
19 | 2589310074780 |
20 | 14419819659960 |
21 | 75181803891480 |
22 | 415298937771900 |
23 | 2196704341517400 |
24 | 12078576672927570 |
[1,0,6,6,90,180,1770,5040,39690,140280,964656, 3922380,24755346,110486376,660153780,3137330196, 18103340970,89794566576,506892467796, 2589310074780,14419819659960,75181803891480, 415298937771900,2196704341517400, 12078576672927570] |