n | a(n) |
---|---|
0 | 4 |
1 | 16 |
2 | 96 |
3 | 688 |
4 | 5280 |
5 | 41584 |
6 | 330720 |
7 | 2639920 |
8 | 21101856 |
9 | 168762352 |
10 | 1349941344 |
11 | 10799058352 |
12 | 86391049632 |
13 | 691124145520 |
14 | 5528980409568 |
15 | 44231805012784 |
16 | 353854325311008 |
17 | 2830834258114288 |
18 | 22646673031792992 |
19 | 181173381154980016 |
[4,16,96,688,5280,41584,330720,2639920,21101856, 168762352,1349941344,10799058352,86391049632, 691124145520,5528980409568,44231805012784, 353854325311008,2830834258114288, 22646673031792992,181173381154980016] |