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 | 4 |
| 3 | 3 |
| 4 | 11 |
| 5 | 2 |
| 6 | 36 |
| 7 | -27 |
| 8 | 142 |
| 9 | -207 |
| 10 | 595 |
| 11 | -1066 |
| 12 | 2497 |
| 13 | -4878 |
| 14 | 10726 |
| 15 | -22189 |
| 16 | 48383 |
| 17 | -103318 |
| 18 | 224296 |
| 19 | -480761 |
| 20 | 1030299 |
| 21 | -2186942 |
| 22 | 4626313 |
| 23 | -9740648 |
| 24 | 20492711 |
| 25 | -43109372 |
| 26 | 90843475 |
| 27 | -191769296 |
| 28 | 405528200 |
| 29 | -858373221 |
| 30 | 1817311451 |
| 31 | -3845483855 |
| 32 | 8129033837 |