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 | 19 |
| 2 | 271 |
| 3 | 5217031 |
| 4 | 68618940391 |
| 5 | 8649148282327007911 |
| 6 | 95289871302753755165078396311 |