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 | 2 |
| 3 | 154 |
| 4 | 2270394624 |
| 5 | 571030462095782973206774552784 |
| 6 | 3824475917061034074298122508414160251634847335755905881951011420229530501911521280 |