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 | 9 |
| 5 | 15 |
| 6 | 18 |
| 7 | 27 |
| 8 | 36 |
| 9 | 51 |
| 10 | 81 |
| 11 | 93 |
| 12 | 169 |
| 13 | 181 |
| 14 | 348 |
| 15 | 444 |
| 16 | 504 |
| 17 | 528 |
| 18 | 1881 |
| 19 | 2031 |
| 20 | 9843 |
| 21 | 16479 |
| 22 | 16685 |
| 23 | 45435 |
| 24 | 129056 |
| 25 | 138510 |
| 26 | 214008 |
| 27 | 358326 |