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 | 120 |
| 2 | 523776 |
| 3 | 1476304896 |
| 4 | 31998395520 |
| 5 | 30823866178560 |
| 6 | 69357059049509038080 |
| 7 | 4010059765937523916800 |
| 8 | 27099073228001299660800 |
| 9 | 686498980761986918441287680 |
| 10 | 2827987212986831882236723200 |
| 11 | 115131961034430181728489308160 |
| 12 | 13361233986454282110797768294400 |
| 13 | 32789312424503984621373515366400 |