n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 305 |
3 | 3825 |
4 | 44481 |
5 | 494721 |
6 | 5346625 |
7 | 56661825 |
8 | 592183361 |
9 | 6126355521 |
10 | 62899732545 |
11 | 642086748225 |
12 | 6525582872641 |
13 | 66093551865921 |
14 | 667637303808065 |
15 | 6729987319337025 |
16 | 67728787443552321 |
17 | 680719188437241921 |
[1,21,305,3825,44481,494721,5346625,56661825, 592183361,6126355521,62899732545,642086748225, 6525582872641,66093551865921,667637303808065, 6729987319337025,67728787443552321, 680719188437241921] |