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 | 1 |
| 2 | 15 |
| 3 | 235 |
| 4 | 14120 |
| 5 | 1712845 |
| 6 | 371515454 |
| 7 | 127635996839 |
| 8 | 65417303558808 |
| 9 | 47718183491375681 |
| 10 | 47736450176936606373 |
| 11 | 63553335359217380046467 |
| 12 | 109839393591932655104274298 |
| 13 | 241347279732331127743077516005 |