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 | 252 |
| 5 | 1 |
| 6 | 1 |
| 7 | 3003 |
| 8 | 3003 |
| 9 | 1 |
| 10 | 1 |
| 11 | 15504 |
| 12 | 184756 |
| 13 | 15504 |
| 14 | 1 |
| 15 | 1 |
| 16 | 53130 |
| 17 | 3268760 |
| 18 | 3268760 |
| 19 | 53130 |
| 20 | 1 |
| 21 | 1 |
| 22 | 142506 |
| 23 | 30045015 |
| 24 | 155117520 |
| 25 | 30045015 |
| 26 | 142506 |
| 27 | 1 |
| 28 | 1 |
| 29 | 324632 |
| 30 | 183579396 |
| 31 | 3247943160 |
| 32 | 3247943160 |
| 33 | 183579396 |
| 34 | 324632 |
| 35 | 1 |
| 36 | 1 |
| 37 | 658008 |
| 38 | 847660528 |
| 39 | 40225345056 |