n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 3 |
5 | 24 |
6 | 136 |
7 | 612 |
8 | 2616 |
9 | 10480 |
10 | 41364 |
11 | 159780 |
12 | 613919 |
13 | 2341920 |
14 | 8919204 |
15 | 33905164 |
16 | 128904660 |
17 | 490213680 |
18 | 1866117224 |
19 | 7111777860 |
20 | 27140327757 |
21 | 103721217388 |
22 | 396974621676 |
23 | 1521577377012 |
24 | 5840546872280 |
[0,0,0,3,24,136,612,2616,10480,41364,159780, 613919,2341920,8919204,33905164,128904660, 490213680,1866117224,7111777860,27140327757, 103721217388,396974621676,1521577377012, 5840546872280] |