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 | 0 |
| 3 | 6 |
| 4 | 128 |
| 5 | 600 |
| 6 | 2688 |
| 7 | 7350 |
| 8 | 19968 |
| 9 | 42336 |
| 10 | 89600 |
| 11 | 163350 |
| 12 | 297600 |
| 13 | 490776 |
| 14 | 809088 |
| 15 | 1242150 |
| 16 | 1906688 |
| 17 | 2774400 |
| 18 | 4036608 |
| 19 | 5633766 |
| 20 | 7862400 |
| 21 | 10613400 |
| 22 | 14326400 |
| 23 | 18818646 |
| 24 | 24718848 |
| 25 | 31740000 |