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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 28 |
| 6 | 16 |
| 7 | 256 |
| 8 | 324 |
| 9 | 3600 |
| 10 | 3600 |
| 11 | 129744 |
| 12 | 63504 |
| 13 | 3521232 |
| 14 | 3459600 |
| 15 | 60891840 |
| 16 | 91240704 |
| 17 | 8048712960 |
| 18 | 3554067456 |
| 19 | 425476094976 |
| 20 | 320265446400 |
| 21 | 12474417291264 |
| 22 | 16417666704384 |
| 23 | 2778580249611264 |
| 24 | 1142807773593600 |
| 25 | 172593628397420544 |