n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 0 |
4 | 12 |
5 | 0 |
6 | 0 |
7 | 840 |
8 | 0 |
9 | 0 |
10 | 50400 |
11 | 831600 |
12 | 0 |
13 | 0 |
14 | 302702400 |
15 | 1135134000 |
16 | 14529715200 |
17 | 0 |
18 | 2315673360000 |
19 | 15545887156800 |
20 | 140792940288000 |
21 | 443497761907200 |
22 | 28006062372288000 |
23 | 623360743125120000 |
[1,2,0,12,0,0,840,0,0,50400,831600,0,0,302702400, 1135134000,14529715200,0,2315673360000, 15545887156800,140792940288000,443497761907200, 28006062372288000,623360743125120000] |