n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 12 |
5 | 48 |
6 | 720 |
7 | 4320 |
8 | 60480 |
9 | 483840 |
10 | 7257600 |
11 | 72576000 |
12 | 1197504000 |
13 | 14370048000 |
14 | 261534873600 |
15 | 3661488230400 |
16 | 73229764608000 |
17 | 1171676233728000 |
18 | 25609494822912000 |
19 | 460970906812416000 |
20 | 10948059036794880000 |
21 | 218961180735897600000 |
22 | 5620003638888038400000 |
[0,0,0,12,48,720,4320,60480,483840,7257600, 72576000,1197504000,14370048000,261534873600, 3661488230400,73229764608000,1171676233728000, 25609494822912000,460970906812416000, 10948059036794880000,218961180735897600000, 5620003638888038400000] |