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 | 6 |
| 2 | 384 |
| 3 | 19494 |
| 4 | 960000 |
| 5 | 47073606 |
| 6 | 2306841984 |
| 7 | 113036904294 |
| 8 | 5538819840000 |
| 9 | 271402252867206 |
| 10 | 13298710955443584 |
| 11 | 651636840771389094 |
| 12 | 31930205225480640000 |
| 13 | 1564580056242329380806 |
| 14 | 76664422757230585805184 |
| 15 | 3756556715113793827473894 |
| 16 | 184071279040642363407360000 |