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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -5 |
| 4 | 7 |
| 5 | 1 |
| 6 | -14 |
| 7 | 73 |
| 8 | -168 |
| 9 | 148 |
| 10 | 1 |
| 11 | -27 |
| 12 | 298 |
| 13 | -1719 |
| 14 | 5473 |
| 15 | -9162 |
| 16 | 6396 |
| 17 | 1 |
| 18 | -44 |
| 19 | 830 |
| 20 | -8756 |
| 21 | 56453 |
| 22 | -227744 |
| 23 | 562060 |
| 24 | -778800 |
| 25 | 468576 |
| 26 | 1 |
| 27 | -65 |
| 28 | 1865 |
| 29 | -31070 |
| 30 | 332463 |
| 31 | -2385305 |
| 32 | 11612795 |
| 33 | -37875240 |
| 34 | 79269676 |
| 35 | -96420480 |
| 36 | 52148160 |
| 37 | 1 |
| 38 | -90 |
| 39 | 3647 |
| 40 | -87900 |
| 41 | 140202 |