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 | 4 |
| 1 | 16 |
| 2 | -8 |
| 3 | -36 |
| 4 | 72 |
| 5 | -36 |
| 6 | -63 |
| 7 | 126 |
| 8 | -63 |
| 9 | -90 |
| 10 | 180 |
| 11 | -90 |
| 12 | -117 |
| 13 | 234 |
| 14 | -117 |
| 15 | -144 |
| 16 | 288 |
| 17 | -144 |
| 18 | -171 |
| 19 | 342 |
| 20 | -171 |
| 21 | -198 |
| 22 | 396 |
| 23 | -198 |
| 24 | -225 |
| 25 | 450 |
| 26 | -225 |
| 27 | -252 |
| 28 | 504 |
| 29 | -252 |
| 30 | -279 |
| 31 | 558 |
| 32 | -279 |
| 33 | -306 |
| 34 | 612 |
| 35 | -306 |
| 36 | -333 |
| 37 | 666 |
| 38 | -333 |
| 39 | -360 |
| 40 | 720 |
| 41 | -360 |
| 42 | -387 |
| 43 | 774 |
| 44 | -387 |
| 45 | -414 |
| 46 | 828 |
| 47 | -414 |
| 48 | -441 |
| 49 | 882 |
| 50 | -441 |
| 51 | -468 |
| 52 | 936 |
| 53 | -468 |
| 54 | -495 |
| 55 | 990 |
| 56 | -495 |