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 | 55 |
| 2 | 24342 |
| 3 | 7594361 |
| 4 | 2548684656 |
| 5 | 842518533590 |
| 6 | 279533139565077 |
| 7 | 92657526436631289 |
| 8 | 30721240815429999078 |
| 9 | 10185111919160666118608 |
| 10 | 3376771882017849561260401 |
| 11 | 1119528305492897225312120742 |
| 12 | 371166848426649070379972358241 |
| 13 | 123056076089539426001744759117065 |