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 | 3 |
| 3 | 6 |
| 4 | 63 |
| 5 | 18292 |
| 6 | 822680526 |
| 7 | 810795400558456607 |
| 8 | 3059608561526409532580548135921262544 |
| 9 | 41330361304323764432512049819825720283867354602583921458622085452146872094 |