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 | -9 |
| 2 | 27 |
| 3 | -12 |
| 4 | -90 |
| 5 | 135 |
| 6 | 54 |
| 7 | -99 |
| 8 | -189 |
| 9 | -85 |
| 10 | 657 |
| 11 | -162 |
| 12 | -135 |
| 13 | -171 |
| 14 | -810 |
| 15 | 702 |
| 16 | 495 |
| 17 | 837 |
| 18 | -673 |
| 19 | -900 |
| 20 | 243 |
| 21 | -1053 |
| 22 | -297 |
| 23 | 1566 |
| 24 | 2700 |
| 25 | -1764 |
| 26 | 81 |
| 27 | -1188 |
| 28 | -1377 |
| 29 | 270 |
| 30 | -2043 |
| 31 | 3321 |
| 32 | -756 |
| 33 | 3726 |
| 34 | 3015 |
| 35 | -4563 |
| 36 | -3348 |
| 37 | 504 |
| 38 | -351 |
| 39 | -1350 |
| 40 | -468 |