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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 9 |
| 6 | 16 |
| 7 | 22 |
| 8 | 42 |
| 9 | 57 |
| 10 | 90 |
| 11 | 124 |
| 12 | 204 |
| 13 | 275 |
| 14 | 413 |
| 15 | 562 |
| 16 | 866 |
| 17 | 1161 |
| 18 | 1685 |
| 19 | 2264 |
| 20 | 3308 |
| 21 | 4407 |