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 | 1 |
| 5 | -1 |
| 6 | 1 |
| 7 | -1 |
| 8 | 0 |
| 9 | 1 |
| 10 | -2 |
| 11 | 3 |
| 12 | -4 |
| 13 | 5 |
| 14 | -6 |
| 15 | 7 |
| 16 | -7 |
| 17 | 6 |
| 18 | -4 |
| 19 | 1 |
| 20 | 3 |
| 21 | -8 |
| 22 | 14 |
| 23 | -21 |
| 24 | 28 |
| 25 | -34 |
| 26 | 38 |
| 27 | -40 |
| 28 | 38 |
| 29 | -31 |
| 30 | 18 |
| 31 | 2 |
| 32 | -29 |
| 33 | 62 |
| 34 | -99 |
| 35 | 139 |
| 36 | -178 |
| 37 | 211 |
| 38 | -232 |
| 39 | 234 |
| 40 | -210 |
| 41 | 154 |
| 42 | -62 |
| 43 | -70 |
| 44 | 242 |
| 45 | -449 |
| 46 | 680 |
| 47 | -917 |
| 48 | 1135 |
| 49 | -1303 |
| 50 | 1386 |
| 51 | -1344 |
| 52 | 1136 |
| 53 | -725 |
| 54 | 85 |
| 55 | 794 |
| 56 | -1898 |
| 57 | 3183 |
| 58 | -4571 |