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 | 2 |
| 2 | 0 |
| 3 | -2 |
| 4 | 2 |
| 5 | 4 |
| 6 | -4 |
| 7 | -6 |
| 8 | 6 |
| 9 | 10 |
| 10 | -8 |
| 11 | -16 |
| 12 | 14 |
| 13 | 24 |
| 14 | -24 |
| 15 | -36 |
| 16 | 36 |
| 17 | 56 |
| 18 | -52 |
| 19 | -82 |
| 20 | 78 |
| 21 | 116 |
| 22 | -116 |
| 23 | -168 |
| 24 | 166 |
| 25 | 242 |
| 26 | -232 |
| 27 | -338 |
| 28 | 328 |
| 29 | 468 |
| 30 | -464 |
| 31 | -648 |
| 32 | 640 |
| 33 | 892 |
| 34 | -872 |
| 35 | -1214 |
| 36 | 1192 |
| 37 | 1636 |
| 38 | -1620 |
| 39 | -2198 |
| 40 | 2176 |