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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 6 |
| 6 | 5 |
| 7 | 1 |
| 8 | 24 |
| 9 | 26 |
| 10 | 9 |
| 11 | 1 |
| 12 | 120 |
| 13 | 154 |
| 14 | 71 |
| 15 | 14 |
| 16 | 1 |
| 17 | 720 |
| 18 | 1044 |
| 19 | 580 |
| 20 | 155 |
| 21 | 20 |
| 22 | 1 |
| 23 | 5040 |
| 24 | 8028 |
| 25 | 5104 |
| 26 | 1665 |
| 27 | 295 |
| 28 | 27 |
| 29 | 1 |
| 30 | 40320 |
| 31 | 69264 |
| 32 | 48860 |
| 33 | 18424 |
| 34 | 4025 |
| 35 | 511 |
| 36 | 35 |
| 37 | 1 |
| 38 | 362880 |
| 39 | 663696 |
| 40 | 509004 |
| 41 | 214676 |
| 42 | 54649 |
| 43 | 8624 |
| 44 | 826 |
| 45 | 44 |
| 46 | 1 |
| 47 | 3628800 |
| 48 | 6999840 |
| 49 | 5753736 |
| 50 | 2655764 |