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 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | -3 |
| 8 | 3 |
| 9 | -1 |
| 10 | 1 |
| 11 | -4 |
| 12 | 6 |
| 13 | -4 |
| 14 | 1 |
| 15 | 1 |
| 16 | -8 |
| 17 | 22 |
| 18 | -28 |
| 19 | 17 |
| 20 | -4 |
| 21 | 1 |
| 22 | -12 |
| 23 | 54 |
| 24 | -116 |
| 25 | 129 |
| 26 | -72 |
| 27 | 16 |
| 28 | 1 |
| 29 | -36 |
| 30 | 342 |
| 31 | -1412 |
| 32 | 2913 |
| 33 | -3168 |
| 34 | 1744 |
| 35 | -384 |
| 36 | 1 |
| 37 | -60 |
| 38 | 1206 |
| 39 | -9620 |
| 40 | 36801 |
| 41 | -73080 |
| 42 | 77776 |
| 43 | -42240 |
| 44 | 9216 |
| 45 | 1 |
| 46 | -252 |
| 47 | 12726 |
| 48 | -241172 |
| 49 | 1883841 |
| 50 | -7138872 |
| 51 | 14109136 |
| 52 | -14975232 |
| 53 | 8119296 |
| 54 | -1769472 |