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 | 3 |
| 2 | 36 |
| 3 | 504 |
| 4 | 720 |
| 5 | 1404 |
| 6 | 19656 |
| 7 | 28080 |
| 8 | 44640 |
| 9 | 181440 |
| 10 | 195840 |
| 11 | 1740960 |
| 12 | 7637760 |
| 13 | 46085760 |
| 14 | 65862720 |
| 15 | 105960960 |
| 16 | 12884705280 |
| 17 | 16729130880 |
| 18 | 22826833920 |
| 19 | 38463828480 |
| 20 | 502503505920 |
| 21 | 890246522880 |
| 22 | 3377622411509760 |
| 23 | 131727274048880640 |
| 24 | 55340232208243752960 |
| 25 | 2158269056121506365440 |