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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | -3 |
| 5 | 16 |
| 6 | -27 |
| 7 | 66 |
| 8 | -79 |
| 9 | 96 |
| 10 | 129 |
| 11 | -686 |
| 12 | 2429 |
| 13 | -5520 |
| 14 | 11125 |
| 15 | -15438 |
| 16 | 10785 |
| 17 | 36032 |
| 18 | -182591 |
| 19 | 556194 |
| 20 | -1279171 |
| 21 | 2393296 |
| 22 | -3187131 |
| 23 | 1157666 |
| 24 | 10934481 |
| 25 | -48082656 |
| 26 | 136730689 |
| 27 | -304493326 |
| 28 | 539172285 |
| 29 | -647406800 |
| 30 | -53647147 |
| 31 | 3352290450 |
| 32 | -12929496767 |
| 33 | 34720868736 |
| 34 | -74092036479 |