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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 0 |
| 4 | -2 |
| 5 | 5 |
| 6 | 11 |
| 7 | -14 |
| 8 | -34 |
| 9 | 57 |
| 10 | 127 |
| 11 | -209 |
| 12 | -461 |
| 13 | 793 |
| 14 | 1717 |
| 15 | -3002 |
| 16 | -6434 |
| 17 | 11441 |
| 18 | 24311 |
| 19 | -43757 |
| 20 | -92377 |
| 21 | 167961 |
| 22 | 352717 |
| 23 | -646645 |
| 24 | -1352077 |
| 25 | 2496145 |
| 26 | 5200301 |
| 27 | -9657699 |
| 28 | -20058299 |
| 29 | 37442161 |
| 30 | 77558761 |
| 31 | -145422674 |
| 32 | -300540194 |
| 33 | 565722721 |
| 34 | 1166803111 |
| 35 | -2203961429 |