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 | -299 |
| 2 | 2063 |
| 3 | -8948 |
| 4 | 29034 |
| 5 | -77537 |
| 6 | 180137 |
| 7 | -376946 |
| 8 | 727116 |
| 9 | -1314087 |
| 10 | 2251475 |
| 11 | -3689600 |
| 12 | 5822654 |
| 13 | -8896509 |
| 14 | 13217165 |
| 15 | -19159838 |
| 16 | 27178688 |
| 17 | -37817187 |
| 18 | 51719127 |
| 19 | -69640268 |
| 20 | 92460626 |
| 21 | -121197401 |
| 22 | 157018545 |
| 23 | -201256970 |
| 24 | 255425396 |