n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 0 |
4 | 24 |
5 | 120 |
6 | 1080 |
7 | 2520 |
8 | 40320 |
9 | 302400 |
10 | 4838400 |
11 | 33264000 |
12 | 498960000 |
13 | 5448643200 |
14 | 98075577600 |
15 | 1242290649600 |
16 | 21620216217600 |
17 | 337903056691200 |
18 | 6624678348288000 |
19 | 119786633597030400 |
20 | 2466692313845760000 |
21 | 50371208660957184000 |
22 | 1133144384491671552000 |
[1,1,2,0,24,120,1080,2520,40320,302400,4838400, 33264000,498960000,5448643200,98075577600, 1242290649600,21620216217600,337903056691200, 6624678348288000,119786633597030400, 2466692313845760000,50371208660957184000, 1133144384491671552000] |