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 | 3 |
| 2 | 54 |
| 3 | 1116 |
| 4 | 21334 |
| 5 | 386495 |
| 6 | 6621074 |
| 7 | 108796955 |
| 8 | 1735753333 |
| 9 | 27144561576 |