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 | -3 |
| 2 | 1 |
| 3 | 12 |
| 4 | -6 |
| 5 | 1 |
| 6 | -55 |
| 7 | 33 |
| 8 | -9 |
| 9 | 1 |
| 10 | 273 |
| 11 | -182 |
| 12 | 63 |
| 13 | -12 |
| 14 | 1 |
| 15 | -1428 |
| 16 | 1020 |
| 17 | -408 |
| 18 | 102 |
| 19 | -15 |
| 20 | 1 |
| 21 | 7752 |
| 22 | -5814 |
| 23 | 2565 |
| 24 | -760 |
| 25 | 150 |
| 26 | -18 |
| 27 | 1 |
| 28 | -43263 |
| 29 | 33649 |
| 30 | -15939 |
| 31 | 5313 |
| 32 | -1265 |
| 33 | 207 |
| 34 | -21 |
| 35 | 1 |
| 36 | 246675 |
| 37 | -197340 |
| 38 | 98670 |
| 39 | -35880 |
| 40 | 9750 |
| 41 | -1950 |
| 42 | 273 |
| 43 | -24 |
| 44 | 1 |