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 | -1 |
| 8 | -1 |
| 9 | 8 |
| 10 | -8 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 7 |
| 15 | -27 |
| 16 | 19 |
| 17 | 19 |
| 18 | -27 |
| 19 | 7 |
| 20 | 1 |
| 21 | -1 |
| 22 | -21 |
| 23 | 54 |
| 24 | 54 |
| 25 | -276 |
| 26 | 276 |
| 27 | -54 |
| 28 | -54 |
| 29 | 21 |
| 30 | 1 |
| 31 | 1 |
| 32 | 51 |
| 33 | -25 |
| 34 | -675 |
| 35 | 1650 |
| 36 | -1002 |
| 37 | -1002 |
| 38 | 1650 |
| 39 | -675 |
| 40 | -25 |
| 41 | 51 |
| 42 | 1 |
| 43 | -1 |
| 44 | -113 |
| 45 | -372 |
| 46 | 3436 |
| 47 | -5125 |
| 48 | -5013 |
| 49 | 21216 |
| 50 | -21216 |
| 51 | 5013 |
| 52 | 5125 |
| 53 | -3436 |
| 54 | 372 |
| 55 | 113 |
| 56 | 1 |