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 | 2 |
| 2 | 6 |
| 3 | 18 |
| 4 | 54 |
| 5 | 564 |
| 6 | 3512 |
| 7 | 6542 |
| 8 | 564163 |
| 9 | 2063689 |
| 10 | 54400028 |
| 11 | 5586502348 |
| 12 | 252252704148404 |
| 13 | 971269945245201 |
| 14 | 3745011184713964 |