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 | 1 |
| 7 | -1 |
| 8 | 1 |
| 9 | -2 |
| 10 | 2 |
| 11 | -2 |
| 12 | 2 |
| 13 | -3 |
| 14 | 4 |
| 15 | -4 |
| 16 | 4 |
| 17 | -5 |
| 18 | 7 |
| 19 | -8 |
| 20 | 8 |
| 21 | -9 |
| 22 | 12 |
| 23 | -15 |
| 24 | 16 |
| 25 | -17 |
| 26 | 21 |
| 27 | -27 |
| 28 | 31 |
| 29 | -33 |
| 30 | 38 |
| 31 | -48 |
| 32 | 58 |
| 33 | -64 |
| 34 | 71 |
| 35 | -86 |
| 36 | 106 |
| 37 | -122 |
| 38 | 135 |
| 39 | -157 |
| 40 | 192 |
| 41 | -228 |
| 42 | 257 |
| 43 | -292 |
| 44 | 349 |
| 45 | -420 |
| 46 | 485 |
| 47 | -549 |
| 48 | 641 |
| 49 | -769 |
| 50 | 905 |
| 51 | -1034 |
| 52 | 1190 |
| 53 | -1410 |
| 54 | 1674 |
| 55 | -1939 |
| 56 | 2224 |
| 57 | -2600 |