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 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 17 |
| 5 | 17 |
| 6 | 227 |
| 7 | 227 |
| 8 | 5297 |
| 9 | 5297 |
| 10 | 5297 |
| 11 | 226817 |
| 12 | 1227497 |
| 13 | 2270483 |
| 14 | 5967617 |
| 15 | 8617187 |
| 16 | 27311693 |
| 17 | 39928787 |
| 18 | 39928787 |
| 19 | 345664343 |
| 20 | 345664343 |