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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 4 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 24 |
| 15 | 0 |
| 16 | 24 |
| 17 | 0 |
| 18 | 276 |
| 19 | 0 |
| 20 | 176 |
| 21 | 0 |
| 22 | 2604 |
| 23 | 0 |
| 24 | 1876 |
| 25 | 0 |
| 26 | 25736 |
| 27 | 0 |
| 28 | 17384 |
| 29 | 0 |
| 30 | 248816 |
| 31 | 0 |
| 32 | 173064 |
| 33 | 0 |
| 34 | 2424608 |
| 35 | 0 |
| 36 | 1668712 |
| 37 | 0 |
| 38 | 23581056 |
| 39 | 0 |
| 40 | 16317480 |
| 41 | 0 |
| 42 | 229513584 |
| 43 | 0 |
| 44 | 158435296 |
| 45 | 0 |
| 46 | 2233386048 |
| 47 | 0 |
| 48 | 1543447264 |
| 49 | 0 |
| 50 | 21733496960 |