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 | -2 |
| 3 | 12 |
| 4 | -20 |
| 5 | 30 |
| 6 | -24 |
| 7 | 56 |
| 8 | -104 |
| 9 | 117 |
| 10 | -60 |
| 11 | 132 |
| 12 | -240 |
| 13 | 182 |
| 14 | -112 |
| 15 | 360 |
| 16 | -464 |
| 17 | 306 |
| 18 | -234 |
| 19 | 380 |
| 20 | -600 |
| 21 | 672 |
| 22 | -264 |
| 23 | 552 |
| 24 | -1248 |
| 25 | 775 |
| 26 | -364 |
| 27 | 1080 |
| 28 | -1120 |
| 29 | 870 |
| 30 | -720 |
| 31 | 992 |
| 32 | -1952 |
| 33 | 1584 |
| 34 | -612 |
| 35 | 1680 |
| 36 | -2340 |
| 37 | 1406 |
| 38 | -760 |
| 39 | 2184 |
| 40 | -3120 |
| 41 | 1722 |
| 42 | -1344 |
| 43 | 1892 |
| 44 | -2640 |
| 45 | 3510 |
| 46 | -1104 |
| 47 | 2256 |