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 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 24 |
| 5 | 48 |
| 6 | 240 |
| 7 | 720 |
| 8 | 5040 |
| 9 | 10080 |
| 10 | 20160 |
| 11 | 221760 |
| 12 | 665280 |
| 13 | 8648640 |
| 14 | 17297280 |
| 15 | 294053760 |
| 16 | 2205403200 |
| 17 | 27935107200 |
| 18 | 293318625600 |
| 19 | 1927522396800 |
| 20 | 8995104518400 |
| 21 | 26985313555200 |
| 22 | 782574093100800 |
| 23 | 24259796886124800 |
| 24 | 48519593772249600 |
| 25 | 1795224969573235200 |
| 26 | 8976124847866176000 |
| 27 | 368021118762513216000 |