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 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 3 |
| 5 | 1 |
| 6 | -1 |
| 7 | 5 |
| 8 | 5 |
| 9 | 1 |
| 10 | 1 |
| 11 | 7 |
| 12 | 19 |
| 13 | 7 |
| 14 | 1 |
| 15 | 1 |
| 16 | 9 |
| 17 | 71 |
| 18 | 41 |
| 19 | 9 |
| 20 | 1 |
| 21 | -1 |
| 22 | 11 |
| 23 | 265 |
| 24 | 239 |
| 25 | 71 |
| 26 | 11 |
| 27 | 1 |
| 28 | -1 |
| 29 | 13 |
| 30 | 989 |
| 31 | 1393 |
| 32 | 559 |
| 33 | 109 |
| 34 | 13 |
| 35 | 1 |
| 36 | 1 |
| 37 | 15 |
| 38 | 3691 |
| 39 | 8119 |
| 40 | 4401 |
| 41 | 1079 |
| 42 | 155 |
| 43 | 15 |
| 44 | 1 |
| 45 | 1 |
| 46 | 17 |
| 47 | 13775 |
| 48 | 47321 |
| 49 | 34649 |
| 50 | 10681 |
| 51 | 1847 |
| 52 | 209 |
| 53 | 17 |
| 54 | 1 |