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 | -3 |
| 3 | -2 |
| 4 | 9 |
| 5 | 0 |
| 6 | -32 |
| 7 | 18 |
| 8 | 108 |
| 9 | -118 |
| 10 | -333 |
| 11 | 576 |
| 12 | 911 |
| 13 | -2466 |
| 14 | -2040 |
| 15 | 9702 |
| 16 | 2529 |
| 17 | -35622 |
| 18 | 8254 |
| 19 | 122436 |
| 20 | -88275 |
| 21 | -391882 |
| 22 | 501660 |
| 23 | 1148334 |
| 24 | -2331810 |
| 25 | -2949282 |
| 26 | 9689949 |
| 27 | 5791930 |
| 28 | -37155906 |
| 29 | -2645148 |
| 30 | 133051344 |
| 31 | -54698868 |
| 32 | -445531893 |
| 33 | 408566282 |
| 34 | 1383325848 |
| 35 | -2115234972 |