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 | 1 |
| 2 | 1 |
| 3 | 12 |
| 4 | 12 |
| 5 | 122 |
| 6 | 1225 |
| 7 | 12252 |
| 8 | 122526 |
| 9 | 1225268 |
| 10 | 12252682 |
| 11 | 122526828 |
| 12 | 1225268284 |
| 13 | 12252682845 |
| 14 | 122526828457 |
| 15 | 1225268284577 |
| 16 | 12252682845779 |
| 17 | 122526828457797 |
| 18 | 1225268284577978 |
| 19 | 12252682845779785 |
| 20 | 122526828457797852 |