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 | -2 |
| 4 | 5 |
| 5 | -4 |
| 6 | 0 |
| 7 | -6 |
| 8 | 26 |
| 9 | -16 |
| 10 | 6 |
| 11 | -31 |
| 12 | 93 |
| 13 | -81 |
| 14 | 19 |
| 15 | -147 |
| 16 | 310 |
| 17 | -295 |
| 18 | 136 |
| 19 | -486 |
| 20 | 1069 |
| 21 | -940 |
| 22 | 645 |
| 23 | -1575 |
| 24 | 3338 |
| 25 | -3021 |
| 26 | 2301 |
| 27 | -5089 |
| 28 | 9735 |
| 29 | -9381 |
| 30 | 7548 |
| 31 | -15506 |
| 32 | 27556 |
| 33 | -27587 |
| 34 | 23664 |
| 35 | -44862 |
| 36 | 76043 |
| 37 | -77620 |
| 38 | 70982 |
| 39 | -124744 |
| 40 | 204389 |
| 41 | -211376 |
| 42 | 203644 |
| 43 | -336775 |