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 | 14 |
| 3 | 142 |
| 4 | 1428 |
| 5 | 14285 |
| 6 | 142857 |
| 7 | 1428571 |
| 8 | 14285714 |
| 9 | 142857142 |
| 10 | 1428571428 |
| 11 | 14285714285 |
| 12 | 142857142857 |
| 13 | 1428571428571 |
| 14 | 14285714285714 |
| 15 | 142857142857142 |
| 16 | 1428571428571428 |
| 17 | 14285714285714285 |
| 18 | 142857142857142857 |
| 19 | 1428571428571428571 |
| 20 | 14285714285714285714 |