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) |
|---|---|
| 4 | 17 |
| 5 | 827 |
| 6 | 22319071 |
| 7 | 1718296754087 |
| 8 | 35662591735219 |
| 9 | 477262171871 |
| 10 | 1609727002420791262479701 |
| 11 | 146215297537890243023 |
| 12 | 2020914387433686758547638152441 |
| 13 | 1073774770807266077323 |