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 | 5 |
| 3 | 11 |
| 4 | -23 |
| 5 | -41 |
| 6 | 45 |
| 7 | -29 |
| 8 | 337 |
| 9 | 1199 |
| 10 | -3115 |
| 11 | -6469 |
| 12 | 10297 |
| 13 | 8839 |
| 14 | 16125 |
| 15 | 108691 |
| 16 | -354143 |
| 17 | -873121 |
| 18 | 1721765 |
| 19 | 2521451 |
| 20 | -1476983 |
| 21 | 6699319 |
| 22 | -34182195 |
| 23 | -103232189 |
| 24 | 242017777 |
| 25 | 451910159 |
| 26 | -597551755 |
| 27 | -130656229 |
| 28 | -2465133863 |
| 29 | -10513816601 |
| 30 | 29729597085 |
| 31 | 66349305331 |
| 32 | -116749235903 |