n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 336 |
3 | 5040 |
4 | 75600 |
5 | 1164240 |
6 | 18627840 |
7 | 311351040 |
8 | 5448643200 |
9 | 99891792000 |
10 | 1917922406400 |
11 | 38532804710400 |
12 | 809188898918400 |
13 | 17739910476288000 |
14 | 405483668029440000 |
15 | 9650511299100672000 |
[1,21,336,5040,75600,1164240,18627840,311351040, 5448643200,99891792000,1917922406400, 38532804710400,809188898918400,17739910476288000, 405483668029440000,9650511299100672000] |