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 | 0 |
| 2 | 4 |
| 3 | 17 |
| 4 | 1 |
| 5 | 82 |
| 6 | 324 |
| 7 | 49 |
| 8 | 961 |
| 9 | 5185 |
| 10 | 2501 |
| 11 | 5776 |
| 12 | 57600 |
| 13 | 54290 |
| 14 | 15625 |
| 15 | 497026 |
| 16 | 801025 |
| 17 | 1 |
| 18 | 3437317 |
| 19 | 9120400 |
| 20 | 1256641 |
| 21 | 18714277 |
| 22 | 85766122 |
| 23 | 38850289 |
| 24 | 72999937 |