n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 14 |
3 | 118 |
4 | 1210 |
5 | 14730 |
6 | 208110 |
7 | 3350550 |
8 | 60580170 |
9 | 1215657450 |
10 | 26813382750 |
11 | 644830644150 |
12 | 16793095369050 |
13 | 470839138619850 |
14 | 14140985865756750 |
15 | 452938463797569750 |
16 | 15412288335824630250 |
17 | 555226177657611710250 |
18 | 21111260070730770690750 |
[0,2,14,118,1210,14730,208110,3350550,60580170, 1215657450,26813382750,644830644150, 16793095369050,470839138619850,14140985865756750, 452938463797569750,15412288335824630250, 555226177657611710250,21111260070730770690750] |