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 | 63 |
| 3 | 6705 |
| 4 | 1960804 |
| 5 | 1271288295 |
| 6 | 1541975757831 |
| 7 | 3135880743480163 |
| 8 | 9904953891455450640 |
| 9 | 45915662047529291081589 |
| 10 | 299038026557168514632822455 |
| 11 | 2642895689915240835222121682301 |
| 12 | 30814273315381549790551229559722628 |