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 | 1 |
| 4 | 3 |
| 5 | -5 |
| 6 | 1 |
| 7 | 10 |
| 8 | -24 |
| 9 | 18 |
| 10 | 52 |
| 11 | -182 |
| 12 | 180 |
| 13 | 348 |
| 14 | -1474 |
| 15 | 1733 |
| 16 | 2407 |
| 17 | -12557 |
| 18 | 17145 |
| 19 | 16561 |
| 20 | -111041 |
| 21 | 172625 |
| 22 | 107783 |
| 23 | -1006217 |
| 24 | 1759149 |
| 25 | 592699 |
| 26 | -9265399 |
| 27 | 18081483 |
| 28 | 1574873 |
| 29 | -86180045 |
| 30 | 186977185 |
| 31 | -25366798 |
| 32 | -805909936 |
| 33 | 1941467634 |
| 34 | -657563052 |