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 | 6 |
| 3 | 24 |
| 4 | 480 |
| 5 | 1536 |
| 6 | 30720 |
| 7 | 98304 |
| 8 | 1966080 |
| 9 | 132120576 |
| 10 | 402653184 |
| 11 | 33822867456 |
| 12 | 515396075520 |
| 13 | 1649267441664 |
| 14 | 32985348833280 |
| 15 | 2216615441596416 |
| 16 | 141863388262170624 |
| 17 | 432345564227567616 |
| 18 | 36317027395115679744 |
| 19 | 553402322211286548480 |
| 20 | 1770887431076116955136 |
| 21 | 148754544210393824231424 |