This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 7 | 721 |
| 8 | 5761 |
| 9 | 51841 |
| 10 | 518401 |
| 11 | 5702401 |
| 12 | 68428801 |
| 13 | 889574401 |
| 14 | 12454041601 |
| 15 | 186810624001 |
| 16 | 2988969984001 |
| 17 | 50812489728001 |
| 18 | 914624815104001 |
| 19 | 17377871486976001 |
| 20 | 347557429739520001 |
| 21 | 7298706024529920001 |