n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 24 |
4 | 108 |
5 | 552 |
6 | 3144 |
7 | 19392 |
8 | 129168 |
9 | 920736 |
10 | 6958944 |
11 | 55582848 |
12 | 466824384 |
13 | 4104798336 |
14 | 37688879232 |
15 | 360236187648 |
16 | 3575154053376 |
17 | 36768528142848 |
18 | 391060780180992 |
19 | 4293782854170624 |
20 | 48597548604926976 |
21 | 566152604314232832 |
22 | 6780179847538722816 |
23 | 83375209195856216064 |
[1,2,6,24,108,552,3144,19392,129168,920736, 6958944,55582848,466824384,4104798336,37688879232, 360236187648,3575154053376,36768528142848, 391060780180992,4293782854170624, 48597548604926976,566152604314232832, 6780179847538722816,83375209195856216064] |