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 | 4 |
| 2 | 12 |
| 3 | 40 |
| 4 | 24 |
| 5 | 168 |
| 6 | 480 |
| 7 | 160 |
| 8 | 224 |
| 9 | 2464 |
| 10 | 6240 |
| 11 | 1440 |
| 12 | 1120 |
| 13 | 2464 |
| 14 | 36960 |
| 15 | 84864 |
| 16 | 14976 |
| 17 | 8064 |
| 18 | 9856 |
| 19 | 29568 |
| 20 | 561792 |
| 21 | 1188096 |
| 22 | 169728 |
| 23 | 69888 |
| 24 | 59136 |
| 25 | 98560 |
| 26 | 374528 |
| 27 | 8614144 |
| 28 | 16972800 |
| 29 | 2036736 |
| 30 | 678912 |
| 31 | 439296 |
| 32 | 506880 |
| 33 | 1070080 |
| 34 | 4922368 |
| 35 | 132903936 |
| 36 | 246105600 |
| 37 | 25459200 |
| 38 | 7128576 |
| 39 | 3734016 |
| 40 | 3294720 |
| 41 | 4815360 |