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 | 19 |
| 2 | -145 |
| 3 | 100 |
| 4 | 2191 |
| 5 | -8598 |
| 6 | 14516 |
| 7 | -29080 |
| 8 | 114575 |
| 9 | -320417 |
| 10 | 615666 |
| 11 | -1125492 |
| 12 | 2139700 |
| 13 | -3664750 |
| 14 | 5997448 |
| 15 | -10103304 |
| 16 | 15992719 |
| 17 | -23857290 |
| 18 | 36059435 |
| 19 | -53341900 |
| 20 | 75622578 |
| 21 | -105762592 |
| 22 | 145414140 |
| 23 | -198974280 |
| 24 | 271923764 |
| 25 | -359683403 |
| 26 | 468557626 |