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 | 1 |
| 5 | -1 |
| 6 | -1 |
| 7 | 5 |
| 8 | -1 |
| 9 | 1 |
| 10 | 5 |
| 11 | -11 |
| 12 | 1 |
| 13 | 1 |
| 14 | 1 |
| 15 | 9 |
| 16 | -11 |
| 17 | -11 |
| 18 | 9 |
| 19 | -1 |
| 20 | -1 |
| 21 | -9 |
| 22 | -9 |
| 23 | 51 |
| 24 | -29 |
| 25 | 1 |
| 26 | 1 |
| 27 | -1 |
| 28 | -1 |
| 29 | -57 |
| 30 | 111 |
| 31 | -29 |
| 32 | -29 |
| 33 | 13 |
| 34 | -1 |
| 35 | 1 |
| 36 | -15 |
| 37 | 113 |
| 38 | -111 |
| 39 | -111 |
| 40 | 169 |
| 41 | -55 |
| 42 | 1 |
| 43 | 1 |
| 44 | 1 |
| 45 | -31 |
| 46 | 113 |
| 47 | 113 |
| 48 | -559 |
| 49 | 449 |
| 50 | -55 |
| 51 | -55 |
| 52 | 17 |
| 53 | -1 |