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 | 6 |
| 2 | 41 |
| 3 | 226 |
| 4 | 1373 |
| 5 | 8257 |
| 6 | 49302 |
| 7 | 295083 |
| 8 | 1768323 |
| 9 | 10586331 |
| 10 | 63381624 |
| 11 | 379549120 |
| 12 | 2272625520 |
| 13 | 13607838241 |
| 14 | 81481468232 |
| 15 | 487893203155 |
| 16 | 2921396482557 |
| 17 | 17492709806652 |
| 18 | 104742608145023 |
| 19 | 627176268025963 |
| 20 | 3755397674479571 |