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 | -1 |
| 3 | -3 |
| 4 | 0 |
| 5 | 8 |
| 6 | 6 |
| 7 | -21 |
| 8 | -37 |
| 9 | 45 |
| 10 | 175 |
| 11 | -22 |
| 12 | -703 |
| 13 | -533 |
| 14 | 2370 |
| 15 | 4321 |
| 16 | -5930 |
| 17 | -23560 |
| 18 | 3534 |
| 19 | 104035 |
| 20 | 81083 |
| 21 | -376267 |
| 22 | -705158 |
| 23 | 993738 |
| 24 | 4047745 |
| 25 | -604007 |
| 26 | -18622243 |
| 27 | -14895477 |
| 28 | 69622834 |
| 29 | 133284470 |
| 30 | -188549209 |
| 31 | -784970693 |
| 32 | 110402283 |