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 | 0 |
| 3 | 1 |
| 4 | -3 |
| 5 | 7 |
| 6 | -14 |
| 7 | 25 |
| 8 | -41 |
| 9 | 64 |
| 10 | -100 |
| 11 | 165 |
| 12 | -294 |
| 13 | 550 |
| 14 | -1023 |
| 15 | 1795 |
| 16 | -2823 |
| 17 | 3658 |
| 18 | -2882 |
| 19 | -2873 |
| 20 | 20435 |
| 21 | -62185 |
| 22 | 148863 |
| 23 | -314008 |
| 24 | 613957 |
| 25 | -1155794 |
| 26 | 2175823 |
| 27 | -4244026 |
| 28 | 8753538 |
| 29 | -19006490 |
| 30 | 42471787 |
| 31 | -95234575 |
| 32 | 210395407 |
| 33 | -453413866 |
| 34 | 949508390 |
| 35 | -1931939460 |