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 | -3 |
| 3 | 1 |
| 4 | 13 |
| 5 | 4 |
| 6 | -49 |
| 7 | -46 |
| 8 | 165 |
| 9 | 284 |
| 10 | -476 |
| 11 | -1417 |
| 12 | 1003 |
| 13 | 6220 |
| 14 | -110 |
| 15 | -24644 |
| 16 | -14831 |
| 17 | 88184 |
| 18 | 113224 |
| 19 | -278288 |
| 20 | -619744 |
| 21 | 715647 |
| 22 | 2891977 |
| 23 | -1036173 |
| 24 | -12068353 |
| 25 | -3381661 |
| 26 | 45588556 |
| 27 | 41600921 |
| 28 | -154355594 |
| 29 | -259984429 |
| 30 | 448828716 |
| 31 | 1305250324 |
| 32 | -964837159 |
| 33 | -5754843123 |