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 | 1 |
| 2 | 8 |
| 3 | 216 |
| 4 | 864 |
| 5 | 108000 |
| 6 | 12000 |
| 7 | 4116000 |
| 8 | 16464000 |
| 9 | 1333584000 |
| 10 | 1333584000 |
| 11 | 1775000304000 |
| 12 | 1775000304000 |
| 13 | 3899675667888000 |
| 14 | 3899675667888000 |
| 15 | 3899675667888000 |
| 16 | 15598702671552000 |
| 17 | 76636426225334976000 |
| 18 | 2838386156493888000 |
| 19 | 19468490647391577792000 |
| 20 | 19468490647391577792000 |