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) |
|---|---|
| 0 | 9 |
| 1 | 81 |
| 2 | 801 |
| 3 | 8001 |
| 4 | 80001 |
| 5 | 800001 |
| 6 | 8000001 |
| 7 | 80000001 |
| 8 | 800000001 |
| 9 | 8000000001 |
| 10 | 80000000001 |
| 11 | 800000000001 |
| 12 | 8000000000001 |
| 13 | 80000000000001 |
| 14 | 800000000000001 |
| 15 | 8000000000000001 |
| 16 | 80000000000000001 |
| 17 | 800000000000000001 |
| 18 | 8000000000000000001 |
| 19 | 80000000000000000001 |
| 20 | 800000000000000000001 |