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 | -9 |
| 3 | 1 |
| 4 | 162 |
| 5 | -27 |
| 6 | 1 |
| 7 | -4374 |
| 8 | 891 |
| 9 | -54 |
| 10 | 1 |
| 11 | 157464 |
| 12 | -36450 |
| 13 | 2835 |
| 14 | -90 |
| 15 | 1 |
| 16 | -7085880 |
| 17 | 1797714 |
| 18 | -164025 |
| 19 | 6885 |
| 20 | -135 |
| 21 | 1 |
| 22 | 382637520 |
| 23 | -104162436 |
| 24 | 10655064 |
| 25 | -535815 |
| 26 | 14175 |
| 27 | -189 |
| 28 | 1 |
| 29 | -24106163760 |
| 30 | 6944870988 |
| 31 | -775431468 |
| 32 | 44411409 |
| 33 | -1428840 |
| 34 | 26082 |
| 35 | -252 |
| 36 | 1 |