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) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 48 |
| 3 | 480 |
| 4 | 5760 |
| 5 | 80640 |
| 6 | 1290240 |
| 7 | 23224320 |
| 8 | 464486400 |
| 9 | 10218700800 |
| 10 | 245248819200 |
| 11 | 6376469299200 |
| 12 | 178541140377600 |
| 13 | 5356234211328000 |
| 14 | 171399494762496000 |
| 15 | 5827582821924864000 |
| 16 | 209792981589295104000 |
| 17 | 7972133300393213952000 |
| 18 | 318885332015728558080000 |