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 | -9 |
| 4 | -117 |
| 5 | 216 |
| 6 | 27 |
| 7 | -450 |
| 8 | 459 |
| 9 | -9 |
| 10 | -648 |
| 11 | 1080 |
| 12 | -117 |
| 13 | -1530 |
| 14 | 1350 |
| 15 | 216 |
| 16 | -1845 |
| 17 | 2592 |
| 18 | 27 |
| 19 | -3258 |
| 20 | 2808 |
| 21 | -450 |
| 22 | -3240 |
| 23 | 4752 |
| 24 | 459 |
| 25 | -5409 |
| 26 | 4590 |
| 27 | -9 |
| 28 | -5850 |
| 29 | 7560 |
| 30 | -648 |
| 31 | -8658 |
| 32 | 7371 |
| 33 | 1080 |
| 34 | -7776 |
| 35 | 10800 |
| 36 | -117 |
| 37 | -12330 |
| 38 | 9774 |
| 39 | -1530 |
| 40 | -11016 |
| 41 | 15120 |
| 42 | 1350 |
| 43 | -16650 |