n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 270 |
4 | 5505 |
5 | 124818 |
6 | 3028200 |
7 | 76896180 |
8 | 2018211930 |
9 | 54311811330 |
10 | 1490518569747 |
11 | 41556060361920 |
12 | 1173726329836125 |
13 | 33513124885393020 |
14 | 965755118941566180 |
15 | 28051840723006217040 |
16 | 820439774630057541690 |
[1,3,15,270,5505,124818,3028200,76896180, 2018211930,54311811330,1490518569747, 41556060361920,1173726329836125,33513124885393020, 965755118941566180,28051840723006217040, 820439774630057541690] |