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) |
|---|---|
| 0 | 0 |
| 1 | 5 |
| 2 | 75 |
| 3 | 875 |
| 4 | 9375 |
| 5 | 96875 |
| 6 | 984375 |
| 7 | 9921875 |
| 8 | 99609375 |
| 9 | 998046875 |
| 10 | 9990234375 |
| 11 | 99951171875 |
| 12 | 999755859375 |
| 13 | 9998779296875 |
| 14 | 99993896484375 |
| 15 | 999969482421875 |
| 16 | 9999847412109375 |
| 17 | 99999237060546875 |
| 18 | 999996185302734375 |
| 19 | 9999980926513671875 |