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 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 9 |
| 5 | 11 |
| 6 | 13 |
| 7 | 23 |
| 8 | 135 |
| 9 | 187 |
| 10 | 215 |
| 11 | 233 |
| 12 | 313 |
| 13 | 333 |
| 14 | 493 |
| 15 | 1459 |
| 16 | 2753 |
| 17 | 2813 |
| 18 | 6411 |
| 19 | 31191 |
| 20 | 38303 |
| 21 | 41487 |