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 | 1 |
| 2 | 8 |
| 3 | 156 |
| 4 | 5160 |
| 5 | 245976 |
| 6 | 15450912 |
| 7 | 1209613824 |
| 8 | 113666333184 |
| 9 | 12479546880000 |
| 10 | 1568823886181376 |
| 11 | 222308476014034944 |
| 12 | 35069155573323036672 |
| 13 | 6096327654732137496576 |
| 14 | 1158040133351856000000000 |
| 15 | 238674982804212474577944576 |
| 16 | 53050036437721656891731017728 |
| 17 | 12649916782354997981599305302016 |