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 | 1 |
| 1 | 5 |
| 2 | 22 |
| 3 | 12 |
| 4 | 210 |
| 5 | 176 |
| 6 | 1520 |
| 7 | 1080 |
| 8 | 8400 |
| 9 | 55200 |
| 10 | 273280 |
| 11 | 43776 |
| 12 | 2624832 |
| 13 | 7173360 |
| 14 | 71660160 |
| 15 | 100659200 |
| 16 | 34255872 |
| 17 | 178962432 |
| 18 | 3623854080 |
| 19 | 17895751680 |
| 20 | 5413478400 |
| 21 | 43690752000 |
| 22 | 927712542720 |
| 23 | 733008101376 |
| 24 | 1789570252800 |
| 25 | 35917382287360 |
| 26 | 50649120571392 |