n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 28 |
4 | 216 |
5 | 1790 |
6 | 15587 |
7 | 140746 |
8 | 1305920 |
9 | 12374069 |
10 | 119223556 |
11 | 1164465225 |
12 | 11502924648 |
13 | 114721053058 |
14 | 1153539900783 |
[1,4,28,216,1790,15587,140746,1305920,12374069, 119223556,1164465225,11502924648,114721053058, 1153539900783] |