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 | 9 |
| 2 | 161 |
| 3 | 2889 |
| 4 | 51841 |
| 5 | 930249 |
| 6 | 16692641 |
| 7 | 299537289 |
| 8 | 5374978561 |
| 9 | 96450076809 |
| 10 | 1730726404001 |
| 11 | 31056625195209 |
| 12 | 557288527109761 |
| 13 | 10000136862780489 |
| 14 | 179445175002939041 |
| 15 | 3220013013190122249 |
| 16 | 57780789062419261441 |