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) |
|---|---|
| 4 | 7 |
| 5 | 256 |
| 6 | 300 |
| 7 | 16000 |
| 8 | 67375 |
| 9 | 627200 |
| 10 | 642096 |
| 11 | 79027200 |
| 12 | 80041500 |
| 13 | 13660416000 |
| 14 | 13766266800 |
| 15 | 13851661824 |
| 16 | 55686205575 |
| 17 | 16160272128000 |
| 18 | 16216384184000 |
| 19 | 5871257725132800 |
| 20 | 5885894170172016 |
| 21 | 5898489903820800 |