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 | -2 |
| 3 | -1 |
| 4 | 4 |
| 5 | 0 |
| 6 | -4 |
| 7 | 3 |
| 8 | 21 |
| 9 | -4 |
| 10 | -29 |
| 11 | -7 |
| 12 | 51 |
| 13 | -24 |
| 14 | -105 |
| 15 | -7 |
| 16 | 201 |
| 17 | -30 |
| 18 | -291 |
| 19 | 34 |
| 20 | 642 |
| 21 | -42 |
| 22 | -874 |
| 23 | 75 |
| 24 | 1764 |
| 25 | -262 |
| 26 | -2737 |
| 27 | -40 |
| 28 | 4555 |
| 29 | -818 |
| 30 | -7512 |
| 31 | 88 |
| 32 | 12425 |
| 33 | -1492 |
| 34 | -19062 |
| 35 | 1135 |
| 36 | 32637 |
| 37 | -2573 |
| 38 | -47688 |
| 39 | 3576 |
| 40 | 81335 |
| 41 | -6477 |
| 42 | -119540 |
| 43 | 6525 |
| 44 | 193738 |
| 45 | -18478 |
| 46 | -292685 |