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 | 0 |
| 1 | 2 |
| 2 | 280 |
| 3 | 47104 |
| 4 | 1552115753 |
| 5 | 320620847201 |
| 6 | 14010400861700086 |
| 7 | 666566814219424468355 |
| 8 | 1738670860867061382977091021290 |
| 9 | 403468080959285491446589623771973 |