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 | 36 |
| 2 | 144 |
| 3 | 3600 |
| 4 | 3600 |
| 5 | 28224 |
| 6 | 254016 |
| 7 | 129600 |
| 8 | 435600 |
| 9 | 1192464 |
| 10 | 16646400 |
| 11 | 5992704 |
| 12 | 11696400 |
| 13 | 36869184 |
| 14 | 60840000 |
| 15 | 96589584 |
| 16 | 148352400 |
| 17 | 221414400 |
| 18 | 1071645696 |
| 19 | 640494864 |
| 20 | 1186113600 |
| 21 | 1578631824 |
| 22 | 2692364544 |
| 23 | 3457440000 |
| 24 | 5537145744 |
| 25 | 10539075600 |
| 26 | 12873171600 |
| 27 | 68685926400 |