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 | 5 |
| 2 | 71 |
| 3 | 881 |
| 4 | 9929 |
| 5 | 99989 |
| 6 | 999959 |
| 7 | 9999971 |
| 8 | 99999587 |
| 9 | 999999191 |
| 10 | 9999999701 |
| 11 | 99999999761 |
| 12 | 999999999959 |
| 13 | 9999999998489 |
| 14 | 99999999999971 |
| 15 | 999999999997967 |
| 16 | 9999999999999641 |
| 17 | 99999999999998807 |
| 18 | 999999999999998927 |