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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 3 |
| 5 | 5 |
| 6 | 60 |
| 7 | 105 |
| 8 | 35 |
| 9 | 63 |
| 10 | 630 |
| 11 | 1155 |
| 12 | 6930 |
| 13 | 12870 |
| 14 | 24024 |
| 15 | 9009 |
| 16 | 9009 |
| 17 | 17017 |
| 18 | 306306 |
| 19 | 2909907 |
| 20 | 692835 |
| 21 | 1322685 |
| 22 | 58198140 |
| 23 | 111546435 |
| 24 | 66927861 |
| 25 | 128707425 |
| 26 | 371821450 |
| 27 | 717084225 |
| 28 | 20078358300 |
| 29 | 38818159380 |
| 30 | 2329089562800 |
| 31 | 4512611027925 |