n | a(n) |
---|---|
3 | 1 |
4 | 12 |
5 | 120 |
6 | 1040 |
7 | 7840 |
8 | 52864 |
9 | 327936 |
10 | 1912320 |
11 | 10644480 |
12 | 57164800 |
13 | 298428416 |
14 | 1522626560 |
15 | 7622451200 |
16 | 37551144960 |
17 | 182458122240 |
18 | 875972788224 |
19 | 4161315274752 |
20 | 19583780782080 |
21 | 91393766195200 |
[1,12,120,1040,7840,52864,327936,1912320,10644480, 57164800,298428416,1522626560,7622451200, 37551144960,182458122240,875972788224, 4161315274752,19583780782080,91393766195200] |