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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -2 |
| 5 | -2 |
| 6 | 4 |
| 7 | 10 |
| 8 | -6 |
| 9 | -46 |
| 10 | -16 |
| 11 | 214 |
| 12 | 310 |
| 13 | -974 |
| 14 | -3144 |
| 15 | 3674 |
| 16 | 28826 |
| 17 | -566 |
| 18 | -260000 |
| 19 | -254906 |
| 20 | 2345094 |
| 21 | 4894154 |
| 22 | -20901880 |
| 23 | -74737574 |
| 24 | 176084986 |
| 25 | 1072935874 |
| 26 | -1216168944 |
| 27 | -15164335306 |
| 28 | 1862029910 |
| 29 | 214162724194 |
| 30 | 186232275544 |
| 31 | -3026208587366 |
| 32 | -6005924996070 |
| 33 | 42413412401786 |