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 | 4 |
| 2 | 46 |
| 3 | 468 |
| 4 | 4689 |
| 5 | 468910 |
| 6 | 46891012 |
| 7 | 4689101214 |
| 8 | 468910121415 |
| 9 | 46891012141516 |
| 10 | 4689101214151618 |
| 11 | 468910121415161820 |
| 12 | 46891012141516182021 |
| 13 | 4689101214151618202122 |
| 14 | 468910121415161820212224 |