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 | 2 |
| 1 | 6 |
| 2 | 30 |
| 3 | 3150 |
| 4 | 6063750 |
| 5 | 1717605545906250 |
| 6 | 2623719141408662719128738281250 |
| 7 | 1019408754706474658106933474548666805595768826381331909476074218750 |