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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 0 |
| 5 | 1 |
| 6 | 54 |
| 7 | 9 |
| 8 | 0 |
| 9 | 1 |
| 10 | 3861 |
| 11 | 216 |
| 12 | 18 |
| 13 | 0 |
| 14 | 1 |
| 15 | 1028700 |
| 16 | 19305 |
| 17 | 540 |
| 18 | 30 |
| 19 | 0 |
| 20 | 1 |
| 21 | 1067510583 |
| 22 | 6172200 |
| 23 | 57915 |
| 24 | 1080 |
| 25 | 45 |
| 26 | 0 |
| 27 | 1 |
| 28 | 4390552197234 |
| 29 | 7472574081 |
| 30 | 21602700 |
| 31 | 135135 |
| 32 | 1890 |
| 33 | 63 |
| 34 | 0 |
| 35 | 1 |
| 36 | 72022439672173161 |
| 37 | 35124417577872 |
| 38 | 29890296324 |
| 39 | 57607200 |
| 40 | 270270 |
| 41 | 3024 |
| 42 | 84 |
| 43 | 0 |
| 44 | 1 |