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 | 252 |
| 2 | 37422 |
| 3 | 4286520 |
| 4 | 419818707 |
| 5 | 37047106404 |
| 6 | 3037410645984 |
| 7 | 235940417032320 |
| 8 | 17594974122819093 |
| 9 | 1271468563282273356 |
| 10 | 89638618747098243186 |
| 11 | 6196581962116572990600 |
| 12 | 421646012618644954061559 |