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 | 20 |
| 2 | 12 |
| 3 | 14 |
| 4 | 16 |
| 5 | 38 |
| 6 | 49 |
| 7 | 98 |
| 8 | 289 |
| 9 | 689 |
| 10 | 3899 |
| 11 | 5899 |
| 12 | 19999 |
| 13 | 68999 |
| 14 | 88999 |
| 15 | 299999 |
| 16 | 899999 |
| 17 | 5999999 |
| 18 | 7999999 |
| 19 | 49999999 |
| 20 | 98999999 |
| 21 | 199999999 |
| 22 | 889999999 |
| 23 | 2999999999 |
| 24 | 8999999999 |
| 25 | 88999999999 |
| 26 | 299999999999 |
| 27 | 499999999999 |
| 28 | 899999999999 |