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 | 30 |
| 2 | 560 |
| 3 | 8400 |
| 4 | 111216 |
| 5 | 1360800 |
| 6 | 15790720 |
| 7 | 176563200 |
| 8 | 1922176256 |
| 9 | 20518417920 |
| 10 | 215825326080 |
| 11 | 2244998246400 |
| 12 | 23153670762496 |
| 13 | 237224718704640 |
| 14 | 2418102840688640 |
| 15 | 24549985173504000 |
| 16 | 248464183682727936 |