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 | 0 |
| 1 | -1 |
| 2 | 7 |
| 3 | -20 |
| 4 | 44 |
| 5 | -81 |
| 6 | 135 |
| 7 | -208 |
| 8 | 304 |
| 9 | -425 |
| 10 | 575 |
| 11 | -756 |
| 12 | 972 |
| 13 | -1225 |
| 14 | 1519 |
| 15 | -1856 |
| 16 | 2240 |
| 17 | -2673 |
| 18 | 3159 |
| 19 | -3700 |
| 20 | 4300 |
| 21 | -4961 |
| 22 | 5687 |
| 23 | -6480 |
| 24 | 7344 |
| 25 | -8281 |
| 26 | 9295 |
| 27 | -10388 |
| 28 | 11564 |
| 29 | -12825 |
| 30 | 14175 |
| 31 | -15616 |
| 32 | 17152 |
| 33 | -18785 |
| 34 | 20519 |