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 | 3 |
| 1 | 3 |
| 2 | 3 |
| 3 | 9 |
| 4 | 3 |
| 5 | 3 |
| 6 | 3 |
| 7 | 113 |
| 8 | 331 |
| 9 | 513 |
| 10 | 827 |
| 11 | 799 |
| 12 | 3291 |
| 13 | 5041 |
| 14 | 71 |
| 15 | 220221 |
| 16 | 23891 |
| 17 | 11559 |
| 18 | 187503 |
| 19 | 35963 |