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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 2 |
| 8 | -1 |
| 9 | -2 |
| 10 | 1 |
| 11 | 0 |
| 12 | -6 |
| 13 | -7 |
| 14 | 21 |
| 15 | -6 |
| 16 | -3 |
| 17 | 1 |
| 18 | 0 |
| 19 | 24 |
| 20 | 118 |
| 21 | -147 |
| 22 | -91 |
| 23 | 126 |
| 24 | -28 |
| 25 | -3 |
| 26 | 1 |
| 27 | 0 |
| 28 | -120 |
| 29 | -1406 |
| 30 | -109 |
| 31 | 3749 |
| 32 | -2084 |
| 33 | -450 |
| 34 | 514 |
| 35 | -94 |
| 36 | -1 |
| 37 | 1 |
| 38 | 0 |
| 39 | 720 |
| 40 | 16956 |
| 41 | 34240 |
| 42 | -72307 |
| 43 | -15475 |
| 44 | 56286 |
| 45 | -21125 |
| 46 | -674 |
| 47 | 1635 |
| 48 | -262 |
| 49 | 5 |
| 50 | 1 |