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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 196 |
| 8 | 3072 |
| 9 | 42768 |
| 10 | 550000 |
| 11 | 3573856 |
| 12 | 25009344 |
| 13 | 102800672 |
| 14 | 454967744 |
| 15 | 1441238400 |
| 16 | 4811118592 |
| 17 | 12616778208 |
| 18 | 34692705648 |
| 19 | 79514466480 |
| 20 | 189770459200 |
| 21 | 392908083876 |
| 22 | 842040318416 |
| 23 | 1610365515264 |
| 24 | 3172863442176 |
| 25 | 5692888800000 |