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 | 1 |
| 3 | 1 |
| 4 | 25 |
| 5 | 121 |
| 6 | 361 |
| 7 | 841 |
| 8 | 21841 |
| 9 | 547345 |
| 10 | 4541041 |
| 11 | 23292721 |
| 12 | 169658281 |
| 13 | 7550279881 |
| 14 | 95230199065 |
| 15 | 692107448761 |
| 16 | 25431412450081 |
| 17 | 563675083228321 |
| 18 | 9791797014753121 |
| 19 | 112525775579561185 |
| 20 | 3370231071632996281 |
| 21 | 65798618669268652441 |
| 22 | 1345746844683430533961 |