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 | -2 |
| 2 | -2 |
| 3 | 4 |
| 4 | -1 |
| 5 | 12 |
| 6 | -26 |
| 7 | 38 |
| 8 | -51 |
| 9 | 6 |
| 10 | 98 |
| 11 | -190 |
| 12 | 138 |
| 13 | 60 |
| 14 | 132 |
| 15 | -1296 |
| 16 | 2990 |
| 17 | -3738 |
| 18 | 3350 |
| 19 | -3752 |
| 20 | 4077 |
| 21 | 1194 |
| 22 | -12272 |
| 23 | 18528 |
| 24 | -14848 |
| 25 | 9018 |
| 26 | -2002 |
| 27 | 5644 |
| 28 | -86729 |
| 29 | 290596 |
| 30 | -514158 |
| 31 | 611070 |
| 32 | -603150 |
| 33 | 657792 |
| 34 | -952808 |
| 35 | 1406568 |
| 36 | -1208636 |
| 37 | -635286 |
| 38 | 3507362 |
| 39 | -5062866 |
| 40 | 3791614 |