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 | 3 |
| 4 | 4 |
| 5 | 12 |
| 6 | 21 |
| 7 | 24 |
| 8 | 27 |
| 9 | 37 |
| 10 | 66 |
| 11 | 141 |
| 12 | 283 |
| 13 | 294 |
| 14 | 379 |
| 15 | 396 |
| 16 | 1216 |
| 17 | 1639 |
| 18 | 2884 |
| 19 | 3285 |
| 20 | 7734 |
| 21 | 29305 |