n | a(n) |
---|---|
2 | 0 |
3 | 3 |
4 | 12 |
5 | 80 |
6 | 840 |
7 | 630 |
8 | 13440 |
9 | 277200 |
10 | 75600 |
11 | 3326400 |
12 | 116839800 |
13 | 16216200 |
14 | 1210809600 |
15 | 65043178200 |
16 | 5448643200 |
17 | 617512896000 |
18 | 47147109609600 |
19 | 2639867630400 |
20 | 422378820864000 |
21 | 43505018548992000 |
22 | 1742312636064000 |
23 | 374016445875072000 |
24 | 49991305310266320000 |
25 | 1502744648605200000 |
[0,3,12,80,840,630,13440,277200,75600,3326400, 116839800,16216200,1210809600,65043178200, 5448643200,617512896000,47147109609600, 2639867630400,422378820864000,43505018548992000, 1742312636064000,374016445875072000, 49991305310266320000,1502744648605200000] |