n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 12 |
6 | 94 |
7 | 612 |
8 | 3605 |
9 | 19992 |
10 | 106644 |
11 | 554184 |
12 | 2827902 |
13 | 14244120 |
14 | 71073860 |
15 | 352180920 |
16 | 1736103460 |
17 | 8525167680 |
18 | 41741310400 |
19 | 203929367040 |
20 | 994680578505 |
21 | 4845761001756 |
22 | 23586190895078 |
23 | 114731538098100 |
24 | 557859491227841 |
[0,0,0,1,12,94,612,3605,19992,106644,554184, 2827902,14244120,71073860,352180920,1736103460, 8525167680,41741310400,203929367040,994680578505, 4845761001756,23586190895078,114731538098100, 557859491227841] |