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 | 109 |
| 2 | 3911 |
| 3 | 80917 |
| 4 | 1366661 |
| 5 | 20491057 |
| 6 | 285058399 |
| 7 | 3767321791 |
| 8 | 47991893393 |
| 9 | 594421377761 |
| 10 | 7201814452873 |
| 11 | 85713609222697 |
| 12 | 1005238339412819 |
| 13 | 11644468481142713 |
| 14 | 133472665317708923 |
| 15 | 1516047373452105311 |