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 | 0 |
| 2 | 16 |
| 3 | 144 |
| 4 | 768 |
| 5 | 3200 |
| 6 | 11520 |
| 7 | 37632 |
| 8 | 114688 |
| 9 | 331776 |
| 10 | 921600 |
| 11 | 2478080 |
| 12 | 6488064 |
| 13 | 16613376 |
| 14 | 41746432 |
| 15 | 103219200 |
| 16 | 251658240 |
| 17 | 606076928 |
| 18 | 1443889152 |
| 19 | 3406823424 |
| 20 | 7969177600 |
| 21 | 18496880640 |
| 22 | 42630905856 |
| 23 | 97626619904 |
| 24 | 222264557568 |