n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 640 |
4 | 21600 |
5 | 1370880 |
6 | 163924992 |
7 | 37150064640 |
8 | 16065713664000 |
9 | 13343315521536000 |
10 | 21404225432753602560 |
11 | 66631099907380661452800 |
12 | 404128087449517604339712000 |
13 | 4791300434691082493755392000000 |
14 | 111343541043408070030243833839616000 |
[1,4,36,640,21600,1370880,163924992,37150064640, 16065713664000,13343315521536000, 21404225432753602560,66631099907380661452800, 404128087449517604339712000, 4791300434691082493755392000000, 111343541043408070030243833839616000] |