n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 220 |
6 | 2170 |
7 | 27076 |
8 | 409836 |
9 | 7303164 |
10 | 149837028 |
11 | 3479498880 |
12 | 90230486346 |
13 | 2584679465160 |
14 | 81056989408928 |
15 | 2762187020749144 |
16 | 101633218030586364 |
17 | 4015771398425994048 |
18 | 169588657820702174728 |
[1,2,6,30,220,2170,27076,409836,7303164,149837028, 3479498880,90230486346,2584679465160, 81056989408928,2762187020749144, 101633218030586364,4015771398425994048, 169588657820702174728] |