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 | 3 |
| 3 | 1 |
| 4 | 6 |
| 5 | 9 |
| 6 | 1 |
| 7 | 6 |
| 8 | 51 |
| 9 | 18 |
| 10 | 1 |
| 11 | 0 |
| 12 | 210 |
| 13 | 195 |
| 14 | 30 |
| 15 | 1 |
| 16 | 0 |
| 17 | 630 |
| 18 | 1575 |
| 19 | 525 |
| 20 | 45 |
| 21 | 1 |
| 22 | 0 |
| 23 | 1260 |
| 24 | 10080 |
| 25 | 6825 |
| 26 | 1155 |
| 27 | 63 |
| 28 | 1 |
| 29 | 0 |
| 30 | 1260 |
| 31 | 51660 |
| 32 | 71505 |
| 33 | 21840 |
| 34 | 2226 |
| 35 | 84 |
| 36 | 1 |
| 37 | 0 |
| 38 | 0 |
| 39 | 207900 |
| 40 | 623700 |
| 41 | 333585 |
| 42 | 57456 |
| 43 | 3906 |
| 44 | 108 |
| 45 | 1 |
| 46 | 0 |
| 47 | 0 |
| 48 | 623700 |
| 49 | 4573800 |
| 50 | 4293135 |
| 51 | 1195425 |
| 52 | 131670 |