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 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 19 |
| 6 | 31 |
| 7 | 67 |
| 8 | 391 |
| 9 | 583 |
| 10 | 4549 |
| 11 | 917467 |
| 12 | 6777061 |
| 13 | 86794921 |
| 14 | 1421517037 |
| 15 | 171234891469 |