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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 1 |
| 5 | 0 |
| 6 | -3 |
| 7 | 6 |
| 8 | -4 |
| 9 | 1 |
| 10 | 0 |
| 11 | -133 |
| 12 | 423 |
| 13 | -572 |
| 14 | 441 |
| 15 | -214 |
| 16 | 66 |
| 17 | -12 |
| 18 | 1 |
| 19 | 0 |
| 20 | -3040575 |
| 21 | 14412776 |
| 22 | -31680240 |
| 23 | 43389646 |
| 24 | -41821924 |
| 25 | 30276984 |
| 26 | -17100952 |
| 27 | 7701952 |
| 28 | -2794896 |
| 29 | 818036 |
| 30 | -191600 |
| 31 | 35264 |
| 32 | -4936 |
| 33 | 496 |
| 34 | -32 |
| 35 | 1 |