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 | 1 |
| 3 | 0 |
| 4 | -3 |
| 5 | -7 |
| 6 | -4 |
| 7 | 24 |
| 8 | 85 |
| 9 | 99 |
| 10 | -215 |
| 11 | -1196 |
| 12 | -2100 |
| 13 | 1420 |
| 14 | 17512 |
| 15 | 42160 |
| 16 | 9477 |
| 17 | -252073 |
| 18 | -815965 |
| 19 | -736456 |
| 20 | 3365813 |
| 21 | 15248793 |
| 22 | 22861712 |
| 23 | -37036000 |
| 24 | -273657748 |
| 25 | -575046252 |
| 26 | 180950476 |
| 27 | 4658415696 |
| 28 | 13042693000 |
| 29 | 6717278152 |
| 30 | -73400374512 |
| 31 | -275797704864 |
| 32 | -321427878811 |
| 33 | 1012425395135 |