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 | 3 |
| 2 | 2 |
| 3 | 3 |
| 4 | 31 |
| 5 | 25 |
| 6 | 2 |
| 7 | 721 |
| 8 | 16 |
| 9 | 561 |
| 10 | 13 |
| 11 | 3628801 |
| 12 | 11 |
| 13 | 479001601 |
| 14 | 361 |
| 15 | 9 |
| 16 | 316 |
| 17 | 20922789888001 |
| 18 | 281 |
| 19 | 6402373705728001 |
| 20 | 7 |
| 21 | 241 |
| 22 | 1814401 |
| 23 | 1124000727777607680001 |
| 24 | 6 |
| 25 | 1596673 |
| 26 | 239500801 |
| 27 | 1478401 |
| 28 | 181 |