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 | 3 |
| 2 | 83 |
| 3 | 937 |
| 4 | 9833 |
| 5 | 98336 |
| 6 | 998333 |
| 7 | 9994833 |
| 8 | 99983333 |
| 9 | 999939437 |
| 10 | 9999833333 |
| 11 | 99998333336 |
| 12 | 999998333333 |
| 13 | 9999983333336 |
| 14 | 99999983333333 |
| 15 | 999999833333336 |
| 16 | 9999999833333333 |
| 17 | 99999998333333336 |
| 18 | 999999998333333333 |
| 19 | 9999999983333333336 |
| 20 | 99999999983333333333 |
| 21 | 999999999833333333336 |