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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 16 |
| 5 | 21 |
| 6 | 31 |
| 7 | 129 |
| 8 | 221 |
| 9 | 247 |
| 10 | 258 |
| 11 | 1062 |
| 12 | 1593 |
| 13 | 1964 |
| 14 | 2221 |
| 15 | 13516 |
| 16 | 17287 |
| 17 | 18516 |
| 18 | 19821 |
| 19 | 22221 |
| 20 | 28064 |
| 21 | 29631 |
| 22 | 103764 |
| 23 | 182362 |
| 24 | 222221 |
| 25 | 273543 |
| 26 | 1246713 |
| 27 | 1509437 |
| 28 | 1635219 |
| 29 | 1856538 |
| 30 | 2222221 |
| 31 | 2253804 |
| 32 | 2749249 |
| 33 | 2784807 |
| 34 | 11619096 |
| 35 | 11949507 |