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 | 56 |
| 2 | 4368 |
| 3 | 489280 |
| 4 | 75851776 |
| 5 | 15658639360 |
| 6 | 4165906530304 |
| 7 | 1390437378293760 |
| 8 | 569462999991975936 |
| 9 | 280969831084430721024 |
| 10 | 164441704270786486861824 |
| 11 | 112668650067303149573505024 |