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 | 5 |
| 2 | 23 |
| 3 | 11 |
| 4 | 71 |
| 5 | 503 |
| 6 | 62270207 |
| 7 | 871782911 |
| 8 | 121645100408831 |
| 9 | 243290200817663 |
| 10 | 304888344611713860501503 |
| 11 | 137637530912263450463159795815809023 |