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 | 2 |
| 2 | 1 |
| 3 | 0 |
| 4 | 5 |
| 5 | 4 |
| 6 | 0 |
| 7 | 143 |
| 8 | 25 |
| 9 | 0 |
| 10 | 2 |
| 11 | 1 |
| 12 | 0 |
| 13 | 77 |
| 14 | 715 |
| 15 | 0 |
| 16 | 125 |
| 17 | 5882353 |
| 18 | 0 |
| 19 | 52631579 |
| 20 | 1 |
| 21 | 0 |
| 22 | 5 |
| 23 | 4347826087 |
| 24 | 0 |
| 25 | 8 |
| 26 | 385 |
| 27 | 0 |
| 28 | 3575 |
| 29 | 3448275862069 |
| 30 | 0 |
| 31 | 0 |
| 32 | 625 |
| 33 | 0 |
| 34 | 29411765 |
| 35 | 286 |
| 36 | 0 |
| 37 | 0 |
| 38 | 263157895 |
| 39 | 0 |
| 40 | 5 |
| 41 | 0 |
| 42 | 0 |
| 43 | 0 |
| 44 | 25 |
| 45 | 0 |
| 46 | 21739130435 |
| 47 | 2127659574468085106383 |
| 48 | 0 |