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 | -2 |
| 3 | 2 |
| 4 | 2 |
| 5 | -6 |
| 6 | 2 |
| 7 | 10 |
| 8 | -14 |
| 9 | -6 |
| 10 | 34 |
| 11 | -22 |
| 12 | -46 |
| 13 | 90 |
| 14 | 2 |
| 15 | -182 |
| 16 | 178 |
| 17 | 186 |
| 18 | -542 |
| 19 | 170 |
| 20 | 914 |
| 21 | -1254 |
| 22 | -574 |
| 23 | 3082 |
| 24 | -1934 |
| 25 | -4230 |
| 26 | 8098 |
| 27 | 362 |
| 28 | -16558 |
| 29 | 15834 |
| 30 | 17282 |
| 31 | -48950 |
| 32 | 14386 |
| 33 | 83514 |
| 34 | -112286 |
| 35 | -54742 |
| 36 | 279314 |
| 37 | -169830 |
| 38 | -388798 |
| 39 | 728458 |