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 | 5 |
| 2 | 409 |
| 3 | 21147 |
| 4 | 18378580 |
| 5 | 5116799368 |
| 6 | 20358402201792 |
| 7 | 14216413305846436 |
| 8 | 152834688133255075552 |
| 9 | 204451723997895101749260 |