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 | 3 |
| 4 | 12 |
| 5 | 15 |
| 6 | 5 |
| 7 | 210 |
| 8 | 840 |
| 9 | 2520 |
| 10 | 2520 |
| 11 | 27720 |
| 12 | 27720 |
| 13 | 360360 |
| 14 | 360360 |
| 15 | 180180 |
| 16 | 720720 |
| 17 | 3063060 |
| 18 | 340340 |
| 19 | 58198140 |
| 20 | 29099070 |
| 21 | 58198140 |
| 22 | 58198140 |
| 23 | 1338557220 |
| 24 | 2677114440 |
| 25 | 13385572200 |
| 26 | 13385572200 |
| 27 | 40156716600 |
| 28 | 40156716600 |
| 29 | 1164544781400 |
| 30 | 582272390700 |
| 31 | 18050444111700 |
| 32 | 144403552893600 |