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 | 4 |
| 3 | 105 |
| 4 | 120 |
| 5 | 109395 |
| 6 | 55440 |
| 7 | 1856277675 |
| 8 | 42325920 |
| 9 | 966710699955 |
| 10 | 7210803600 |
| 11 | 303646176781042095 |
| 12 | 43790142876480 |
| 13 | 2432266195067253069525 |
| 14 | 6338767304469600 |
| 15 | 12793596869123737224933375 |
| 16 | 659267412349963697280 |