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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 1 |
| 6 | 30 |
| 7 | 1 |
| 8 | 105 |
| 9 | 28 |
| 10 | 630 |
| 11 | 1 |
| 12 | 207900 |
| 13 | 1 |
| 14 | 12012 |
| 15 | 45045 |
| 16 | 675675 |
| 17 | 1 |
| 18 | 171531360 |
| 19 | 1 |
| 20 | 2618916300 |
| 21 | 3527160 |
| 22 | 3879876 |
| 23 | 1 |
| 24 | 139143023019000 |
| 25 | 10626 |
| 26 | 67603900 |
| 27 | 43743700 |
| 28 | 21925567263600 |
| 29 | 1 |
| 30 | 2360561385517335000 |
| 31 | 1 |
| 32 | 203067496256625 |
| 33 | 14902327440 |