n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 24 |
4 | 144 |
5 | 960 |
6 | 7200 |
7 | 60480 |
8 | 564480 |
9 | 5806080 |
10 | 65318400 |
11 | 798336000 |
12 | 10538035200 |
13 | 149448499200 |
14 | 2266635571200 |
15 | 36614882304000 |
16 | 627683696640000 |
17 | 11381997699072000 |
18 | 217680705994752000 |
[0,0,4,24,144,960,7200,60480,564480,5806080, 65318400,798336000,10538035200,149448499200, 2266635571200,36614882304000,627683696640000, 11381997699072000,217680705994752000] |