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 | 12 |
| 2 | 1342 |
| 3 | 135642 |
| 4 | 13578642 |
| 5 | 13579108642 |
| 6 | 135791112108642 |
| 7 | 1357911131412108642 |
| 8 | 13579111315161412108642 |
| 9 | 135791113151718161412108642 |
| 10 | 1357911131517192018161412108642 |