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 | 5 |
| 3 | 33 |
| 4 | 250 |
| 5 | 2000 |
| 6 | 16666 |
| 7 | 142857 |
| 8 | 1250000 |
| 9 | 11111111 |
| 10 | 100000000 |
| 11 | 909090909 |
| 12 | 8333333333 |
| 13 | 76923076923 |
| 14 | 714285714285 |
| 15 | 6666666666666 |
| 16 | 62500000000000 |
| 17 | 588235294117647 |
| 18 | 5555555555555555 |
| 19 | 52631578947368421 |
| 20 | 500000000000000000 |