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 | 12 |
| 4 | 120 |
| 5 | 240 |
| 6 | 2520 |
| 7 | 10920 |
| 8 | 21840 |
| 9 | 32760 |
| 10 | 65520 |
| 11 | 600600 |
| 12 | 900900 |
| 13 | 1801800 |
| 14 | 3603600 |
| 15 | 4455360 |
| 16 | 8910720 |
| 17 | 17821440 |
| 18 | 46060560 |
| 19 | 69090840 |
| 20 | 92121120 |
| 21 | 126977760 |
| 22 | 138181680 |
| 23 | 245044800 |
| 24 | 414545040 |
| 25 | 490089600 |
| 26 | 507911040 |
| 27 | 1015822080 |
| 28 | 1266665400 |
| 29 | 1523733120 |
| 30 | 2533330800 |