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 | 4 |
| 2 | 33 |
| 3 | 404 |
| 4 | 6597 |
| 5 | 134644 |
| 6 | 3297693 |
| 7 | 94228004 |
| 8 | 3077100777 |
| 9 | 113046200164 |
| 10 | 4614532495353 |
| 11 | 207201136625204 |
| 12 | 10149511013598957 |
| 13 | 538592387976486484 |
| 14 | 30779388439090380213 |
| 15 | 1884616483302733144004 |
| 16 | 123087714448128536653137 |
| 17 | 8541524061361098605073604 |