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 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 12 |
| 7 | 8 |
| 8 | 4 |
| 9 | 28 |
| 10 | 1080 |
| 11 | 540 |
| 12 | 36 |
| 13 | 12960 |
| 14 | 44352 |
| 15 | 2160 |
| 16 | 36 |
| 17 | 1797120 |
| 18 | 524160 |
| 19 | 22619520 |
| 20 | 2880 |
| 21 | 1088640 |
| 22 | 4790016000 |
| 23 | 465813504 |
| 24 | 6912 |
| 25 | 5096577024 |
| 26 | 8115883776000 |
| 27 | 5477472000 |
| 28 | 2419200 |
| 29 | 267346759680000 |
| 30 | 124104960000 |
| 31 | 216218419200000 |
| 32 | 244800 |
| 33 | 143187264000 |