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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 4 |
| 5 | 0 |
| 6 | 4 |
| 7 | 4 |
| 8 | 81920 |
| 9 | 81920 |
| 10 | 0 |
| 11 | 0 |
| 12 | 622592 |
| 13 | 4 |
| 14 | 512 |
| 15 | 2304 |
| 16 | 4931584 |
| 17 | 4 |
| 18 | 2304 |
| 19 | 12288 |
| 20 | 4931584 |
| 21 | 512 |
| 22 | 208 |
| 23 | 12288 |
| 24 | 193644 |
| 25 | 12288 |
| 26 | 2304 |
| 27 | 8322048 |
| 28 | 423168 |
| 29 | 0 |
| 30 | 81920 |
| 31 | 0 |
| 32 | 38944768 |
| 33 | 12288 |
| 34 | 0 |
| 35 | 4 |
| 36 | 37880 |
| 37 | 81920 |
| 38 | 4 |
| 39 | 423168 |
| 40 | 37880 |
| 41 | 4 |
| 42 | 80 |
| 43 | 208 |
| 44 | 2298880 |
| 45 | 43632 |
| 46 | 4 |
| 47 | 512 |