n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 3 |
4 | 7 |
5 | 25 |
6 | 121 |
7 | 721 |
8 | 5041 |
9 | 40321 |
10 | 362881 |
11 | 3628801 |
12 | 39916801 |
13 | 479001601 |
14 | 6227020801 |
15 | 87178291201 |
16 | 1307674368001 |
17 | 20922789888001 |
18 | 355687428096001 |
19 | 6402373705728001 |
[1,2,2,3,7,25,121,721,5041,40321,362881,3628801, 39916801,479001601,6227020801,87178291201, 1307674368001,20922789888001,355687428096001, 6402373705728001] |