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) |
|---|---|
| 3 | 84 |
| 4 | 1785 |
| 5 | 299880 |
| 6 | 1020510 |
| 7 | 8897460 |
| 8 | 102612510 |
| 9 | 33367223274 |
| 10 | 249417828660 |
| 11 | 9177835927260 |
| 12 | 10064864238489060 |
| 13 | 5558913993302670 |
| 14 | 15633689593760207970 |
| 15 | 3792821921183752657200 |