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 | -1 |
| 2 | 325 |
| 3 | 5104 |
| 4 | 16578 |
| 5 | 70211956 |
| 6 | 201968338 |
| 7 | 1690592199245 |