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 | 6 |
| 1 | 30 |
| 2 | 90 |
| 3 | 210 |
| 4 | 420 |
| 5 | 756 |
| 6 | 1260 |
| 7 | 1980 |
| 8 | 2970 |
| 9 | 4290 |