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 | 0 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | -1 |
| 9 | 1 |
| 10 | 0 |
| 11 | 0 |
| 12 | -2 |
| 13 | 3 |
| 14 | 0 |
| 15 | -1 |
| 16 | -3 |
| 17 | 6 |
| 18 | -3 |
| 19 | 0 |
| 20 | -6 |
| 21 | 12 |
| 22 | -6 |
| 23 | 0 |
| 24 | -9 |
| 25 | 23 |
| 26 | -17 |
| 27 | 0 |
| 28 | -15 |
| 29 | 47 |
| 30 | -40 |
| 31 | 8 |
| 32 | -24 |
| 33 | 91 |
| 34 | -101 |
| 35 | 34 |
| 36 | -46 |
| 37 | 181 |
| 38 | -230 |
| 39 | 109 |
| 40 | -92 |
| 41 | 354 |
| 42 | -534 |
| 43 | 323 |
| 44 | -208 |
| 45 | 690 |
| 46 | -1177 |
| 47 | 883 |
| 48 | -520 |
| 49 | 1365 |
| 50 | -2603 |
| 51 | 2297 |
| 52 | -1377 |
| 53 | 2760 |
| 54 | -5641 |
| 55 | 5789 |
| 56 | -3721 |
| 57 | 5741 |