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 | -1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 2 |
| 10 | 5 |
| 11 | 5 |
| 12 | 4 |
| 13 | 2 |
| 14 | 0 |
| 15 | 0 |
| 16 | -5 |
| 17 | -10 |
| 18 | -14 |
| 19 | -16 |
| 20 | -16 |
| 21 | -61 |
| 22 | -61 |
| 23 | -56 |
| 24 | -46 |
| 25 | -32 |
| 26 | -16 |
| 27 | 0 |
| 28 | 0 |
| 29 | 61 |
| 30 | 122 |
| 31 | 178 |
| 32 | 224 |
| 33 | 256 |
| 34 | 272 |
| 35 | 272 |
| 36 | 1385 |
| 37 | 1385 |
| 38 | 1324 |
| 39 | 1202 |
| 40 | 1024 |
| 41 | 800 |
| 42 | 544 |
| 43 | 272 |
| 44 | 0 |
| 45 | 0 |
| 46 | -1385 |
| 47 | -2770 |
| 48 | -4094 |
| 49 | -5296 |
| 50 | -6320 |
| 51 | -7120 |
| 52 | -7664 |
| 53 | -7936 |
| 54 | -7936 |
| 55 | -50521 |
| 56 | -50521 |
| 57 | -49136 |
| 58 | -46366 |
| 59 | -42272 |
| 60 | -36976 |
| 61 | -30656 |
| 62 | -23536 |
| 63 | -15872 |
| 64 | -7936 |
| 65 | 0 |