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 | 6 |
| 4 | 2 |
| 5 | 1 |
| 6 | 30 |
| 7 | 18 |
| 8 | 3 |
| 9 | 1 |
| 10 | 264 |
| 11 | 120 |
| 12 | 36 |
| 13 | 4 |
| 14 | 1 |
| 15 | 2520 |
| 16 | 1320 |
| 17 | 300 |
| 18 | 60 |
| 19 | 5 |
| 20 | 1 |
| 21 | 30960 |
| 22 | 15120 |
| 23 | 3960 |
| 24 | 600 |
| 25 | 90 |
| 26 | 6 |
| 27 | 1 |
| 28 | 428400 |
| 29 | 216720 |
| 30 | 52920 |
| 31 | 9240 |
| 32 | 1050 |
| 33 | 126 |
| 34 | 7 |
| 35 | 1 |
| 36 | 6894720 |
| 37 | 3427200 |
| 38 | 866880 |
| 39 | 141120 |
| 40 | 18480 |
| 41 | 1680 |
| 42 | 168 |
| 43 | 8 |
| 44 | 1 |
| 45 | 123742080 |
| 46 | 62052480 |
| 47 | 15422400 |
| 48 | 2600640 |