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 | 6 |
| 2 | 99 |
| 3 | 4590 |
| 4 | 601749 |
| 5 | 223671780 |
| 6 | 236051526780 |
| 7 | 707876792166456 |
| 8 | 6035175245831686020 |
| 9 | 146337688589606021286324 |
| 10 | 10094030504239191283895044707 |
| 11 | 1981045079056219549583047340549844 |