n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 260 |
3 | 2800 |
4 | 27216 |
5 | 248640 |
6 | 2182720 |
7 | 18656000 |
8 | 156544256 |
9 | 1296655360 |
10 | 10641146880 |
11 | 86744985600 |
12 | 703688298496 |
13 | 5688011079680 |
14 | 45855653642240 |
15 | 368956766617600 |
16 | 2964331947687936 |
17 | 23790756829593600 |
[1,20,260,2800,27216,248640,2182720,18656000, 156544256,1296655360,10641146880,86744985600, 703688298496,5688011079680,45855653642240, 368956766617600,2964331947687936, 23790756829593600] |