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 | 151 |
| 2 | 431 |
| 3 | 6581 |
| 4 | 67651 |
| 5 | 241981 |
| 6 | 2081921 |
| 7 | 3395921 |
| 8 | 116900011 |
| 9 | 650086271 |
| 10 | 858613901 |
| 11 | 11736494711 |
| 12 | 50888057851 |
| 13 | 303855349271 |
| 14 | 2459339487751 |
| 15 | 3167880361091 |