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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 12 |
| 4 | 8 |
| 5 | 160 |
| 6 | 224 |
| 7 | 2240 |
| 8 | 4608 |
| 9 | 32512 |
| 10 | 84480 |
| 11 | 485376 |
| 12 | 1464320 |
| 13 | 7401472 |
| 14 | 24608768 |
| 15 | 114606080 |
| 16 | 406093824 |
| 17 | 1793720320 |
| 18 | 6626869248 |
| 19 | 28280881152 |
| 20 | 107384668160 |
| 21 | 448110002176 |
| 22 | 1732341923840 |
| 23 | 7123849183232 |
| 24 | 27866041417728 |