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 | 0 |
| 2 | 4 |
| 3 | 115 |
| 4 | 2263 |
| 5 | 337040438 |
| 6 | 50539060640 |
| 7 | 7074108084209 |
| 8 | 943101044111145 |
| 9 | 121246131347141448 |
| 10 | 15154916165017175118 |
| 11 | 1852191953202054212155 |
| 12 | 222256232357242458252559 |
| 13 | 26266027276128286229296330 |