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 | -6 |
| 4 | -4 |
| 5 | 1 |
| 6 | 20 |
| 7 | 36 |
| 8 | 9 |
| 9 | -1 |
| 10 | -56 |
| 11 | -160 |
| 12 | -120 |
| 13 | -16 |
| 14 | 1 |
| 15 | 144 |
| 16 | 560 |
| 17 | 700 |
| 18 | 300 |
| 19 | 25 |
| 20 | -1 |
| 21 | -352 |
| 22 | -1728 |
| 23 | -3024 |
| 24 | -2240 |
| 25 | -630 |
| 26 | -36 |
| 27 | 1 |
| 28 | 832 |
| 29 | 4928 |
| 30 | 11088 |
| 31 | 11760 |
| 32 | 5880 |
| 33 | 1176 |
| 34 | 49 |
| 35 | -1 |
| 36 | -1920 |
| 37 | -13312 |
| 38 | -36608 |
| 39 | -50688 |
| 40 | -36960 |