n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 24 |
5 | 240 |
6 | 2880 |
7 | 46080 |
8 | 829440 |
9 | 18247680 |
10 | 510935040 |
11 | 15328051200 |
12 | 551809843200 |
13 | 22072393728000 |
14 | 927040536576000 |
15 | 42643864682496000 |
16 | 2217480963489792000 |
17 | 128613895882407936000 |
18 | 7716833752944476160000 |
19 | 509311027694335426560000 |
[1,1,4,24,240,2880,46080,829440,18247680, 510935040,15328051200,551809843200,22072393728000, 927040536576000,42643864682496000, 2217480963489792000,128613895882407936000, 7716833752944476160000,509311027694335426560000] |