n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 128 |
4 | 864 |
5 | 6912 |
6 | 55936 |
7 | 470016 |
8 | 4025600 |
9 | 35144704 |
10 | 311190784 |
11 | 2789206016 |
12 | 25254028288 |
13 | 230652174336 |
14 | 2122466561024 |
15 | 19659305379840 |
16 | 183146187440128 |
17 | 1714933158969344 |
18 | 16131631511164928 |
19 | 152366562180972544 |
[1,4,16,128,864,6912,55936,470016,4025600, 35144704,311190784,2789206016,25254028288, 230652174336,2122466561024,19659305379840, 183146187440128,1714933158969344, 16131631511164928,152366562180972544] |