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 | 0 |
| 2 | 216 |
| 3 | 5184 |
| 4 | 77760 |
| 5 | 933120 |
| 6 | 9797760 |
| 7 | 94058496 |
| 8 | 846526464 |
| 9 | 7255941120 |
| 10 | 59861514240 |
| 11 | 478892113920 |
| 12 | 3735358488576 |
| 13 | 28524555730944 |
| 14 | 213934167982080 |
| 15 | 1579821548175360 |
| 16 | 11510128422420480 |
| 17 | 82872924641427456 |
| 18 | 590469588070170624 |
| 19 | 4168020621671792640 |
| 20 | 29176144351702548480 |