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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 3628801 |
| 12 | 43545601 |
| 13 | 283046401 |
| 14 | 1320883201 |
| 15 | 4953312001 |
| 16 | 15850598401 |
| 17 | 44910028801 |
| 18 | 115482931201 |
| 19 | 274271961601 |
| 20 | 609493248001 |
| 21 | 1279935820801 |
| 22 | 4644633666390681601 |
| 23 | 106826520356358566401 |
| 24 | 1281918194457262387201 |