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 | 83 |
| 3 | 971 |
| 4 | 9887 |
| 5 | 99881 |
| 6 | 999983 |
| 7 | 9999401 |
| 8 | 99999551 |
| 9 | 999999761 |
| 10 | 9999999707 |
| 11 | 99999999947 |
| 12 | 999999998867 |
| 13 | 9999999999083 |
| 14 | 99999999999467 |
| 15 | 999999999997841 |
| 16 | 9999999999997031 |
| 17 | 99999999999998717 |
| 18 | 999999999999999161 |
| 19 | 9999999999999996587 |
| 20 | 99999999999999999803 |