n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 24 |
6 | 175 |
7 | 720 |
8 | 6405 |
9 | 42560 |
10 | 436401 |
11 | 3628800 |
12 | 48073795 |
13 | 479001600 |
14 | 7116730335 |
15 | 88966701824 |
16 | 1474541093025 |
17 | 20922789888000 |
18 | 400160588853025 |
19 | 6402373705728000 |
20 | 133991603578884051 |
21 | 2457732174030848000 |
22 | 55735573291977790575 |
23 | 1124000727777607680000 |
[1,0,1,2,9,24,175,720,6405,42560,436401,3628800, 48073795,479001600,7116730335,88966701824, 1474541093025,20922789888000,400160588853025, 6402373705728000,133991603578884051, 2457732174030848000,55735573291977790575, 1124000727777607680000] |