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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 9 |
| 6 | 15 |
| 7 | 25 |
| 8 | 41 |
| 9 | 75 |
| 10 | 134 |
| 11 | 246 |
| 12 | 428 |
| 13 | 802 |
| 14 | 1454 |
| 15 | 2643 |
| 16 | 4588 |
| 17 | 8851 |
| 18 | 16849 |
| 19 | 32368 |
| 20 | 60504 |
| 21 | 117343 |