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 | 5 |
| 8 | -2 |
| 9 | 1 |
| 10 | 0 |
| 11 | -61 |
| 12 | 16 |
| 13 | -3 |
| 14 | 1 |
| 15 | 0 |
| 16 | 1385 |
| 17 | -272 |
| 18 | 33 |
| 19 | -4 |
| 20 | 1 |
| 21 | 0 |
| 22 | -50521 |
| 23 | 7936 |
| 24 | -723 |
| 25 | 56 |
| 26 | -5 |
| 27 | 1 |
| 28 | 0 |
| 29 | 2702765 |
| 30 | -353792 |
| 31 | 25953 |
| 32 | -1504 |
| 33 | 85 |
| 34 | -6 |
| 35 | 1 |
| 36 | 0 |
| 37 | -199360981 |
| 38 | 22368256 |
| 39 | -1376643 |
| 40 | 64256 |
| 41 | -2705 |
| 42 | 120 |
| 43 | -7 |
| 44 | 1 |
| 45 | 0 |
| 46 | 19391512145 |
| 47 | -1903757312 |
| 48 | 101031873 |
| 49 | -3963904 |
| 50 | 134185 |
| 51 | -4416 |
| 52 | 161 |
| 53 | -8 |
| 54 | 1 |