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 | -1 |
| 3 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 1 |
| 7 | -14 |
| 8 | 21 |
| 9 | -1 |
| 10 | 1 |
| 11 | -29 |
| 12 | 162 |
| 13 | -120 |
| 14 | 1 |
| 15 | 1 |
| 16 | -48 |
| 17 | 540 |
| 18 | -1736 |
| 19 | 844 |
| 20 | -1 |
| 21 | 1 |
| 22 | -71 |
| 23 | 1267 |
| 24 | -8091 |
| 25 | 17022 |
| 26 | -5664 |
| 27 | 1 |
| 28 | 1 |
| 29 | -98 |
| 30 | 2475 |
| 31 | -24908 |
| 32 | 105503 |
| 33 | -158690 |
| 34 | 39045 |
| 35 | -1 |
| 36 | 1 |
| 37 | -129 |
| 38 | 4312 |
| 39 | -60994 |
| 40 | 408508 |
| 41 | -1250056 |
| 42 | 1416673 |