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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 12 |
| 4 | 3 |
| 5 | 15 |
| 6 | 60 |
| 7 | 840 |
| 8 | 105 |
| 9 | 630 |
| 10 | 630 |
| 11 | 13860 |
| 12 | 6930 |
| 13 | 180180 |
| 14 | 360360 |
| 15 | 144144 |
| 16 | 9009 |
| 17 | 306306 |
| 18 | 306306 |
| 19 | 11639628 |
| 20 | 14549535 |
| 21 | 14549535 |
| 22 | 58198140 |
| 23 | 2677114440 |
| 24 | 334639305 |
| 25 | 3346393050 |