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 | 0 |
| 1 | 1 |
| 2 | 31 |
| 3 | 721 |
| 4 | 14911 |
| 5 | 289201 |
| 6 | 5386591 |
| 7 | 97576081 |
| 8 | 1732076671 |
| 9 | 30276117361 |
| 10 | 522861237151 |
| 11 | 8942430185041 |
| 12 | 151728638820031 |
| 13 | 2557404559011121 |
| 14 | 42864668012537311 |
| 15 | 715027614225987601 |
| 16 | 11878335717996660991 |