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 | 2 |
| 4 | 6 |
| 5 | 120 |
| 6 | 40320 |
| 7 | 7 |
| 8 | 3 |
| 9 | 30 |
| 10 | 240 |
| 11 | 403200 |
| 12 | 49 |
| 13 | 14 |
| 14 | 10086 |
| 15 | 722 |
| 16 | 408240 |
| 17 | 368041 |
| 18 | 40466 |
| 19 | 40346 |
| 20 | 6600 |
| 21 | 363626 |
| 22 | 10083 |
| 23 | 46202 |
| 24 | 41790 |
| 25 | 5283 |
| 26 | 362896 |
| 27 | 403946 |
| 28 | 45369 |
| 29 | 363029 |
| 30 | 40354 |
| 31 | 364353 |
| 32 | 408250 |
| 33 | 45632 |
| 34 | 90843 |
| 35 | 368788 |
| 36 | 363040 |
| 37 | 50548 |
| 38 | 807128 |
| 39 | 404792 |
| 40 | 281 |
| 41 | 41308 |