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 | 60 |
| 5 | 180 |
| 6 | 840 |
| 7 | 1260 |
| 8 | 25200 |
| 9 | 27720 |
| 10 | 83160 |
| 11 | 277200 |
| 12 | 720720 |
| 13 | 1081080 |
| 14 | 3603600 |
| 15 | 10810800 |
| 16 | 32432400 |
| 17 | 36756720 |
| 18 | 61261200 |
| 19 | 110270160 |
| 20 | 183783600 |
| 21 | 551350800 |
| 22 | 698377680 |
| 23 | 2095133040 |
| 24 | 2327925600 |
| 25 | 3491888400 |
| 26 | 10475665200 |
| 27 | 48886437600 |
| 28 | 64250746560 |
| 29 | 73329656400 |
| 30 | 80313433200 |