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 | 2 |
| 2 | 0 |
| 3 | -4 |
| 4 | -4 |
| 5 | 6 |
| 6 | 18 |
| 7 | 4 |
| 8 | -48 |
| 9 | -70 |
| 10 | 60 |
| 11 | 288 |
| 12 | 170 |
| 13 | -686 |
| 14 | -1386 |
| 15 | 432 |
| 16 | 4928 |
| 17 | 4806 |
| 18 | -9684 |
| 19 | -27572 |
| 20 | -3672 |
| 21 | 84106 |
| 22 | 118162 |
| 23 | -122388 |
| 24 | -537834 |
| 25 | -284830 |
| 26 | 1386840 |
| 27 | 2688944 |
| 28 | -1103362 |
| 29 | -10181934 |
| 30 | -9354198 |
| 31 | 21404728 |
| 32 | 57921144 |
| 33 | 3663942 |
| 34 | -185437360 |
| 35 | -248708676 |
| 36 | 292137656 |