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) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 41 |
| 4 | 188 |
| 5 | 20777 |
| 6 | 126661 |
| 7 | 375407075 |
| 8 | 4551271607 |
| 9 | 2186878968457691 |
| 10 | 405572061653677013 |
| 11 | 579868609560670025014303 |
| 12 | 756499881167742750802544581 |
| 13 | 90137667815984749912207449629 |
| 14 | 12095883009361301429642260272492831583 |
| 15 | 83142433646555338064479023776802561123293 |