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 | 7 |
| 2 | 89 |
| 3 | 983 |
| 4 | 9941 |
| 5 | 99929 |
| 6 | 999931 |
| 7 | 9999929 |
| 8 | 99999827 |
| 9 | 999999739 |
| 10 | 9999999769 |
| 11 | 99999999763 |
| 12 | 999999999697 |
| 13 | 9999999999443 |
| 14 | 99999999999503 |
| 15 | 999999999999353 |
| 16 | 9999999999999431 |
| 17 | 99999999999999251 |
| 18 | 999999999999999463 |
| 19 | 9999999999999999343 |
| 20 | 99999999999999999199 |