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) |
|---|---|
| 2 | 1 |
| 3 | 12 |
| 4 | 347 |
| 5 | 20429 |
| 6 | 1919660 |
| 7 | 259227625 |
| 8 | 47484618291 |
| 9 | 11331926690549 |
| 10 | 3416394867284954 |
| 11 | 1269892206580345425 |
| 12 | 570576180005762038644 |
| 13 | 304859737124260849580998 |
| 14 | 191049110542296621467314753 |
| 15 | 138786261071300963667336947034 |
| 16 | 115691448070469092032508527982414 |