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 | 4 |
| 2 | 100 |
| 3 | 4739 |
| 4 | 272130 |
| 5 | 16625026 |
| 6 | 1038484760 |
| 7 | 65713691148 |
| 8 | 4209750150062 |
| 9 | 273303096405547 |