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) |
|---|---|
| 3 | 3 |
| 4 | 34 |
| 5 | 345 |
| 6 | 3456 |
| 7 | 34567 |
| 8 | 345678 |
| 9 | 3456789 |
| 10 | 345678910 |
| 11 | 34567891011 |
| 12 | 3456789101112 |
| 13 | 345678910111213 |
| 14 | 34567891011121314 |
| 15 | 3456789101112131415 |
| 16 | 345678910111213141516 |
| 17 | 34567891011121314151617 |
| 18 | 3456789101112131415161718 |
| 19 | 345678910111213141516171819 |