n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 24 |
6 | 121 |
7 | 600 |
8 | 5039 |
9 | 40320 |
10 | 302401 |
11 | 3659040 |
12 | 39916799 |
13 | 399168000 |
14 | 6227020801 |
15 | 87160993920 |
16 | 1100625926399 |
17 | 20922789888000 |
18 | 355687428096001 |
19 | 5335329064665600 |
20 | 121645100408831999 |
21 | 2453176191578112000 |
[0,1,2,5,24,121,600,5039,40320,302401,3659040, 39916799,399168000,6227020801,87160993920, 1100625926399,20922789888000,355687428096001, 5335329064665600,121645100408831999, 2453176191578112000] |