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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 33 |
| 6 | 60 |
| 7 | 99 |
| 8 | 156 |
| 9 | 276 |
| 10 | 438 |
| 11 | 597 |
| 12 | 1134 |
| 13 | 1404 |
| 14 | 2904 |
| 15 | 3522 |
| 16 | 6876 |
| 17 | 7548 |
| 18 | 16680 |
| 19 | 18153 |
| 20 | 39846 |
| 21 | 41805 |