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 | -4 |
| 2 | 8 |
| 3 | -16 |
| 4 | 32 |
| 5 | -56 |
| 6 | 96 |
| 7 | -160 |
| 8 | 256 |
| 9 | -404 |
| 10 | 624 |
| 11 | -944 |
| 12 | 1408 |
| 13 | -2072 |
| 14 | 3008 |
| 15 | -4320 |
| 16 | 6144 |
| 17 | -8648 |
| 18 | 12072 |
| 19 | -16720 |
| 20 | 22976 |
| 21 | -31360 |
| 22 | 42528 |
| 23 | -57312 |
| 24 | 76800 |
| 25 | -102364 |
| 26 | 135728 |
| 27 | -179104 |
| 28 | 235264 |
| 29 | -307672 |
| 30 | 400704 |
| 31 | -519808 |
| 32 | 671744 |
| 33 | -864960 |
| 34 | 1109904 |