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 | 1 |
| 1 | 4 |
| 2 | 44 |
| 3 | 1953 |
| 4 | 4179942 |
| 5 | 42836179578838 |
| 6 | 3958573977160882295479936105 |
| 7 | 36328295343356352083453782833218820307659379901717630389 |