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 | 5 |
| 3 | 41 |
| 4 | 561 |
| 5 | 10281 |
| 6 | 243481 |
| 7 | 6965401 |
| 8 | 235103417 |
| 9 | 9112789817 |
| 10 | 399330154617 |
| 11 | 19502558109177 |
| 12 | 1050527843743993 |
| 13 | 61855087724349433 |
| 14 | 3952225158444979193 |
| 15 | 272326955744655069689 |
| 16 | 20128716335079745234425 |
| 17 | 1588573078022351774367225 |
| 18 | 133323969310853649963402745 |