n | a(n) |
---|---|
3 | 1 |
4 | 12 |
5 | 105 |
6 | 816 |
7 | 5985 |
8 | 42504 |
9 | 296010 |
10 | 2035800 |
11 | 13884156 |
12 | 94143280 |
13 | 635745396 |
14 | 4280561376 |
15 | 28760021745 |
16 | 192928249296 |
17 | 1292706174900 |
18 | 8654327655120 |
19 | 57902201338905 |
20 | 387221678682300 |
21 | 2588713818544245 |
[1,12,105,816,5985,42504,296010,2035800,13884156, 94143280,635745396,4280561376,28760021745, 192928249296,1292706174900,8654327655120, 57902201338905,387221678682300,2588713818544245] |