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) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 1 |
| 7 | 20 |
| 8 | 9 |
| 9 | 1 |
| 10 | 120 |
| 11 | 74 |
| 12 | 15 |
| 13 | 1 |
| 14 | 840 |
| 15 | 638 |
| 16 | 179 |
| 17 | 22 |
| 18 | 1 |
| 19 | 6720 |
| 20 | 5944 |
| 21 | 2070 |
| 22 | 355 |
| 23 | 30 |
| 24 | 1 |
| 25 | 60480 |
| 26 | 60216 |
| 27 | 24574 |
| 28 | 5265 |
| 29 | 625 |
| 30 | 39 |
| 31 | 1 |
| 32 | 604800 |
| 33 | 662640 |
| 34 | 305956 |
| 35 | 77224 |
| 36 | 11515 |
| 37 | 1015 |
| 38 | 49 |
| 39 | 1 |
| 40 | 6652800 |
| 41 | 7893840 |
| 42 | 4028156 |
| 43 | 1155420 |
| 44 | 203889 |
| 45 | 22680 |
| 46 | 1554 |
| 47 | 60 |
| 48 | 1 |
| 49 | 79833600 |