n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 8 |
6 | 40 |
7 | 720 |
8 | 5040 |
9 | 8064 |
10 | 120960 |
11 | 3628800 |
12 | 4435200 |
13 | 479001600 |
14 | 2075673600 |
15 | 17435658240 |
16 | 1307674368000 |
17 | 634023936000 |
18 | 10162497945600 |
19 | 6402373705728000 |
20 | 17377871486976000 |
21 | 810967336058880000 |
[1,1,2,6,8,40,720,5040,8064,120960,3628800, 4435200,479001600,2075673600,17435658240, 1307674368000,634023936000,10162497945600, 6402373705728000,17377871486976000, 810967336058880000] |