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 | 12 |
| 2 | 120 |
| 3 | 4200 |
| 4 | 216720 |
| 5 | 13594320 |
| 6 | 959431200 |
| 7 | 73286046960 |
| 8 | 5928739001280 |
| 9 | 501123204523440 |
| 10 | 43851618007523760 |
| 11 | 3946829550070653840 |
| 12 | 363607619806646296800 |