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) |
|---|---|
| 2 | 3 |
| 3 | 4 |
| 4 | 20 |
| 5 | 12 |
| 6 | 84 |
| 7 | 120 |
| 8 | 360 |
| 9 | 360 |
| 10 | 3960 |
| 11 | 2520 |
| 12 | 32760 |
| 13 | 27720 |
| 14 | 27720 |
| 15 | 55440 |
| 16 | 942480 |
| 17 | 720720 |
| 18 | 13693680 |
| 19 | 12252240 |
| 20 | 12252240 |
| 21 | 12252240 |
| 22 | 281801520 |
| 23 | 232792560 |
| 24 | 1163962800 |
| 25 | 1163962800 |
| 26 | 3491888400 |
| 27 | 3491888400 |
| 28 | 101264763600 |
| 29 | 80313433200 |
| 30 | 2489716429200 |
| 31 | 4658179125600 |