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 | 0 |
| 2 | 2 |
| 3 | -6 |
| 4 | -14 |
| 5 | -10 |
| 6 | 32 |
| 7 | 76 |
| 8 | -80 |
| 9 | -340 |
| 10 | -200 |
| 11 | 590 |
| 12 | 2302 |
| 13 | 1890 |
| 14 | -3470 |
| 15 | -11468 |
| 16 | -16254 |
| 17 | 5244 |
| 18 | 57406 |
| 19 | 109340 |
| 20 | 81396 |
| 21 | -158664 |
| 22 | -550388 |
| 23 | -829558 |
| 24 | -359856 |
| 25 | 1509570 |
| 26 | 4333256 |
| 27 | 6198660 |
| 28 | 2628406 |
| 29 | -10133230 |
| 30 | -30439512 |
| 31 | -46214582 |
| 32 | -29696680 |
| 33 | 45589368 |