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 | 8 |
| 3 | -12 |
| 4 | 0 |
| 5 | 54 |
| 6 | -96 |
| 7 | -88 |
| 8 | 0 |
| 9 | -99 |
| 10 | 432 |
| 11 | 540 |
| 12 | 0 |
| 13 | -418 |
| 14 | -704 |
| 15 | -648 |
| 16 | 0 |
| 17 | 594 |
| 18 | -792 |
| 19 | 836 |
| 20 | 0 |
| 21 | 1056 |
| 22 | 4320 |
| 23 | -4104 |
| 24 | 0 |
| 25 | -209 |
| 26 | -3344 |
| 27 | 4104 |
| 28 | 0 |
| 29 | -594 |
| 30 | -5184 |
| 31 | 4256 |
| 32 | 0 |
| 33 | -6480 |
| 34 | 4752 |
| 35 | -4752 |
| 36 | 0 |
| 37 | -298 |
| 38 | 6688 |
| 39 | 5016 |
| 40 | 0 |
| 41 | 17226 |
| 42 | 8448 |
| 43 | -12100 |
| 44 | 0 |
| 45 | -5346 |
| 46 | -32832 |
| 47 | -1296 |
| 48 | 0 |
| 49 | -9063 |