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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 20 |
| 6 | 72 |
| 7 | 42 |
| 8 | 1152 |
| 9 | 1296 |
| 10 | 800 |
| 11 | 110 |
| 12 | 82944 |
| 13 | 156 |
| 14 | 3528 |
| 15 | 155520 |
| 16 | 7962624 |
| 17 | 272 |
| 18 | 2239488 |
| 19 | 342 |
| 20 | 159252480 |
| 21 | 11757312 |
| 22 | 225280 |
| 23 | 506 |
| 24 | 13759414272 |
| 25 | 64000000 |
| 26 | 1277952 |
| 27 | 13060694016 |
| 28 | 192631799808 |
| 29 | 812 |
| 30 | 48372940800 |