n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 24 |
3 | 200 |
4 | 2160 |
5 | 28812 |
6 | 458752 |
7 | 8503056 |
8 | 180000000 |
9 | 4287177620 |
10 | 113515167744 |
11 | 3308603804376 |
12 | 105288694411264 |
13 | 3632897460937500 |
14 | 135107988821114880 |
15 | 5388090449900829728 |
16 | 229385780960233586688 |
17 | 10383890888434362036516 |
18 | 498073600000000000000000 |
[1,4,24,200,2160,28812,458752,8503056,180000000, 4287177620,113515167744,3308603804376, 105288694411264,3632897460937500, 135107988821114880,5388090449900829728, 229385780960233586688,10383890888434362036516, 498073600000000000000000] |