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 | 4 |
| 2 | 9 |
| 3 | 13 |
| 4 | 38 |
| 5 | 42 |
| 6 | 67 |
| 7 | 133 |
| 8 | 134 |
| 9 | 142 |
| 10 | 155 |
| 11 | 167 |
| 12 | 226 |
| 13 | 654 |
| 14 | 5787 |
| 15 | 6703 |
| 16 | 12704 |
| 17 | 25969 |
| 18 | 70198 |
| 19 | 78060 |
| 20 | 235304 |