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 | 2 |
| 1 | 52 |
| 2 | 14952 |
| 3 | 4007632 |
| 4 | 268874213792 |
| 5 | 68836555442592 |
| 6 | 4561331969745081152 |
| 7 | 300550070677246403229312 |
| 8 | 1294530259719904904564091957759232 |
| 9 | 331402554328705507772604330809117952 |