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 | 3 |
| 2 | 23 |
| 3 | 2467 |
| 4 | 246809 |
| 5 | 246811 |
| 6 | 24681012141619 |
| 7 | 24681012141618202224262830323436384041 |
| 8 | 24681012141618202224262830323436384042444649 |