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 | -1 |
| 2 | 2 |
| 3 | -2 |
| 4 | 2 |
| 5 | 0 |
| 6 | -4 |
| 7 | 12 |
| 8 | -24 |
| 9 | 40 |
| 10 | -56 |
| 11 | 64 |
| 12 | -48 |
| 13 | -16 |
| 14 | 160 |
| 15 | -416 |
| 16 | 800 |
| 17 | -1280 |
| 18 | 1728 |
| 19 | -1856 |
| 20 | 1152 |
| 21 | 1152 |
| 22 | -6016 |
| 23 | 14336 |
| 24 | -26368 |
| 25 | 40704 |
| 26 | -52736 |
| 27 | 52736 |
| 28 | -24064 |
| 29 | -57344 |
| 30 | 220160 |
| 31 | -488448 |
| 32 | 862208 |
| 33 | -1284096 |
| 34 | 1591296 |
| 35 | -1458176 |
| 36 | 348160 |