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 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | -1 |
| 6 | -5 |
| 7 | 13 |
| 8 | 5 |
| 9 | -43 |
| 10 | 4 |
| 11 | 98 |
| 12 | 122 |
| 13 | -638 |
| 14 | -246 |
| 15 | 2912 |
| 16 | -537 |
| 17 | -9419 |
| 18 | -1648 |
| 19 | 47005 |
| 20 | 2243 |
| 21 | -232237 |
| 22 | 87988 |
| 23 | 904267 |
| 24 | -351692 |
| 25 | -4123026 |
| 26 | 1726126 |
| 27 | 20257940 |
| 28 | -14035151 |
| 29 | -86846040 |
| 30 | 73352891 |
| 31 | 387126945 |
| 32 | -358259621 |
| 33 | -1853868355 |
| 34 | 2081413376 |