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 | 1 |
| 10 | 1 |
| 11 | -11 |
| 12 | -15 |
| 13 | -11 |
| 14 | 1 |
| 15 | 1 |
| 16 | -51 |
| 17 | -76 |
| 18 | -76 |
| 19 | -51 |
| 20 | 1 |
| 21 | 1 |
| 22 | -204 |
| 23 | -315 |
| 24 | -350 |
| 25 | -315 |
| 26 | -204 |
| 27 | 1 |
| 28 | 1 |
| 29 | -785 |
| 30 | -1226 |
| 31 | -1422 |
| 32 | -1422 |
| 33 | -1226 |
| 34 | -785 |
| 35 | 1 |
| 36 | 1 |
| 37 | -2995 |
| 38 | -4683 |
| 39 | -5523 |
| 40 | -5775 |
| 41 | -5523 |
| 42 | -4683 |
| 43 | -2995 |
| 44 | 1 |
| 45 | 1 |
| 46 | -11431 |
| 47 | -17830 |
| 48 | -21142 |
| 49 | -22528 |
| 50 | -22528 |