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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 225 |
| 5 | 2704 |
| 6 | 41209 |
| 7 | 769129 |
| 8 | 17139600 |
| 9 | 447195609 |
| 10 | 13450200625 |
| 11 | 460457244900 |
| 12 | 17754399678409 |
| 13 | 764214897046969 |
| 14 | 36442551140059684 |
| 15 | 1912574337188517025 |
| 16 | 109833379421325769609 |
| 17 | 6866586647633870998416 |
| 18 | 465228769500062060333281 |