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 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 6 |
| 6 | 8 |
| 7 | 13 |
| 8 | 20 |
| 9 | 24 |
| 10 | 46 |
| 11 | 59 |
| 12 | 150 |
| 13 | 152 |
| 14 | 198 |
| 15 | 683 |
| 16 | 880 |
| 17 | 1135 |
| 18 | 1907 |
| 19 | 6617 |
| 20 | 10243 |
| 21 | 12016 |