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 | 4 |
| 1 | 25 |
| 2 | 361 |
| 3 | 116281 |
| 4 | 13441851721 |
| 5 | 180680260806215679961 |
| 6 | 32645356640144805339464939649128207984041 |