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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 1 |
| 4 | 20 |
| 5 | 4 |
| 6 | 1 |
| 7 | 120 |
| 8 | 36 |
| 9 | 4 |
| 10 | 1 |
| 11 | 840 |
| 12 | 200 |
| 13 | 36 |
| 14 | 4 |
| 15 | 1 |
| 16 | 6720 |
| 17 | 1720 |
| 18 | 264 |
| 19 | 36 |
| 20 | 4 |
| 21 | 1 |
| 22 | 60480 |
| 23 | 12480 |
| 24 | 2040 |
| 25 | 264 |
| 26 | 36 |
| 27 | 4 |
| 28 | 1 |
| 29 | 604800 |
| 30 | 118560 |
| 31 | 16000 |
| 32 | 2296 |
| 33 | 264 |
| 34 | 36 |
| 35 | 4 |
| 36 | 1 |
| 37 | 6652800 |
| 38 | 1081920 |
| 39 | 149600 |
| 40 | 17280 |
| 41 | 2296 |
| 42 | 264 |
| 43 | 36 |
| 44 | 4 |
| 45 | 1 |
| 46 | 79833600 |
| 47 | 11793600 |
| 48 | 1362240 |
| 49 | 163680 |
| 50 | 18304 |
| 51 | 2296 |
| 52 | 264 |