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 | 4 |
| 2 | 24 |
| 3 | 72 |
| 4 | 288 |
| 5 | 1800 |
| 6 | 2160 |
| 7 | 17640 |
| 8 | 4032 |
| 9 | 9072 |
| 10 | 3360 |
| 11 | 18480 |
| 12 | 20160 |
| 13 | 240240 |
| 14 | 258720 |
| 15 | 1386000 |
| 16 | 19219200 |
| 17 | 183783600 |
| 18 | 194594400 |
| 19 | 205405200 |
| 20 | 432432000 |
| 21 | 454053600 |
| 22 | 8086478400 |
| 23 | 1207720800 |
| 24 | 1260230400 |
| 25 | 24942060000 |
| 26 | 25939742400 |
| 27 | 26937424800 |
| 28 | 195545750400 |
| 29 | 202529527200 |