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 | 6 |
| 3 | 18 |
| 4 | 30 |
| 5 | 270 |
| 6 | 450 |
| 7 | 630 |
| 8 | 2310 |
| 9 | 6750 |
| 10 | 9450 |
| 11 | 22050 |
| 12 | 510510 |
| 13 | 727650 |
| 14 | 2668050 |
| 15 | 3543750 |
| 16 | 4961250 |
| 17 | 25467750 |
| 18 | 29099070 |