n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 26 |
4 | 208 |
5 | 2222 |
6 | 29412 |
7 | 466034 |
8 | 8609344 |
9 | 181818182 |
10 | 4322904100 |
11 | 114308980106 |
12 | 3328297874640 |
13 | 105828636433886 |
14 | 3649115753173828 |
15 | 135637824071393762 |
16 | 5406799097296318720 |
17 | 230095953656704898102 |
[1,2,4,26,208,2222,29412,466034,8609344,181818182, 4322904100,114308980106,3328297874640, 105828636433886,3649115753173828, 135637824071393762,5406799097296318720, 230095953656704898102] |