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 | -11 |
| 2 | 44 |
| 3 | -77 |
| 4 | 132 |
| 5 | -638 |
| 6 | 1771 |
| 7 | -2464 |
| 8 | 5687 |
| 9 | -19371 |
| 10 | 38533 |
| 11 | -66793 |
| 12 | 160710 |
| 13 | -367730 |
| 14 | 747219 |
| 15 | -1458655 |
| 16 | 2888787 |
| 17 | -6357505 |
| 18 | 12977239 |
| 19 | -23575079 |
| 20 | 47325498 |
| 21 | -98587841 |
| 22 | 187236499 |
| 23 | -352094413 |
| 24 | 684939838 |
| 25 | -1333767820 |