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) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 9135630 |
| 3 | 4662857360 |
| 4 | 936670590450 |
| 5 | 94161778046406 |
| 6 | 5562418293759978 |
| 7 | 215717608046511873 |
| 8 | 5945968652327831925 |
| 9 | 123538613356253145400 |
| 10 | 2023270039486328373811 |
| 11 | 27046306550096288483238 |
| 12 | 303378141987182515342992 |
| 13 | 2920054336492521720572276 |