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 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | -6 |
| 8 | 9 |
| 9 | -4 |
| 10 | 1 |
| 11 | -33 |
| 12 | 171 |
| 13 | -247 |
| 14 | 108 |
| 15 | 1 |
| 16 | -289 |
| 17 | 8619 |
| 18 | -44023 |
| 19 | 63340 |
| 20 | -27648 |
| 21 | 1 |
| 22 | -3413 |
| 23 | 911744 |
| 24 | -26978398 |
| 25 | 137635215 |
| 26 | -197965148 |
| 27 | 86400000 |
| 28 | 1 |
| 29 | -50070 |
| 30 | 160195328 |
| 31 | -42565306462 |
| 32 | 1258841772303 |
| 33 | -6421706556188 |
| 34 | 9236348345088 |
| 35 | -4031078400000 |