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 | 17 |
| 2 | 127 |
| 3 | 1237 |
| 4 | 12347 |
| 5 | 123457 |
| 6 | 56789107 |
| 7 | 456789107 |
| 8 | 3456789107 |
| 9 | 4567891011127 |
| 10 | 616263646566676869707 |
| 11 | 13141516171819202122237 |
| 12 | 2021222324252627282930317 |
| 13 | 151617181920212223242526277 |