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 | 2 |
| 2 | 23 |
| 3 | 101 |
| 4 | 1423 |
| 5 | 10243 |
| 6 | 102043 |
| 7 | 1234657 |
| 8 | 10243567 |
| 9 | 100234657 |
| 10 | 1123465789 |
| 11 | 10123457689 |
| 12 | 100123456789 |
| 13 | 1001233458679 |
| 14 | 10011223456879 |
| 15 | 100122334546789 |
| 16 | 1001122334546879 |