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) |
|---|---|
| 3 | 645 |
| 4 | 8911 |
| 5 | 93961 |
| 6 | 997633 |
| 7 | 9995671 |
| 8 | 99971821 |
| 9 | 999828727 |
| 10 | 9999109081 |
| 11 | 99983971501 |
| 12 | 999986341201 |
| 13 | 9999946514845 |
| 14 | 99999856404001 |
| 15 | 999994510007533 |
| 16 | 9999999191658001 |
| 17 | 99999984319096601 |
| 18 | 999999995115616561 |
| 19 | 9999999995077192591 |