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 | 3 |
| 3 | 6 |
| 4 | 28 |
| 5 | 30 |
| 6 | 144 |
| 7 | 183 |
| 8 | 1080 |
| 9 | 1188 |
| 10 | 3780 |
| 11 | 5742 |
| 12 | 52416 |
| 13 | 33462 |
| 14 | 131760 |
| 15 | 251100 |
| 16 | 1290096 |
| 17 | 1145124 |
| 18 | 5702400 |
| 19 | 6804204 |
| 20 | 42336000 |
| 21 | 50176404 |
| 22 | 146352096 |
| 23 | 226041700 |
| 24 | 2333111040 |
| 25 | 1357893000 |
| 26 | 4818528000 |
| 27 | 9395060400 |
| 28 | 47385112320 |
| 29 | 44560482150 |
| 30 | 251337038400 |
| 31 | 264178169640 |