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) |
|---|---|
| 2 | 2 |
| 3 | 4 |
| 4 | 4 |
| 5 | 10 |
| 6 | 7 |
| 7 | 21 |
| 8 | 8 |
| 9 | 10 |
| 10 | 20 |
| 11 | 55 |
| 12 | 13 |
| 13 | 39 |
| 14 | 42 |
| 15 | 31 |
| 16 | 32 |
| 17 | 136 |
| 18 | 19 |
| 19 | 171 |
| 20 | 40 |