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 | 2 |
| 3 | 12 |
| 4 | 32 |
| 5 | 240 |
| 6 | 192 |
| 7 | 4032 |
| 8 | 6912 |
| 9 | 6912 |
| 10 | 153600 |
| 11 | 435456 |
| 12 | 5529600 |
| 13 | 16773120 |
| 14 | 11059200 |
| 15 | 33177600 |
| 16 | 143327232 |
| 17 | 286654464 |
| 18 | 433520640 |
| 19 | 4294901760 |
| 20 | 2627665920 |
| 21 | 6019743744 |
| 22 | 10705305600 |
| 23 | 15925248000 |
| 24 | 15606743040 |
| 25 | 68719214592 |
| 26 | 31850496000 |
| 27 | 93640458240 |
| 28 | 100329062400 |
| 29 | 172009474560 |