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 | -1 |
| 3 | -2 |
| 4 | 1 |
| 5 | 0 |
| 6 | 4 |
| 7 | 2 |
| 8 | 8 |
| 9 | -2 |
| 10 | 4 |
| 11 | -11 |
| 12 | -1 |
| 13 | -25 |
| 14 | -5 |
| 15 | -35 |
| 16 | 13 |
| 17 | -26 |
| 18 | 49 |
| 19 | -6 |
| 20 | 110 |
| 21 | 6 |
| 22 | 159 |
| 23 | -23 |
| 24 | 182 |
| 25 | -141 |
| 26 | 129 |
| 27 | -358 |
| 28 | 62 |
| 29 | -640 |
| 30 | 39 |
| 31 | -897 |
| 32 | 237 |
| 33 | -1013 |
| 34 | 771 |
| 35 | -914 |
| 36 | 1793 |
| 37 | -664 |
| 38 | 3143 |
| 39 | -565 |
| 40 | 4635 |
| 41 | -1157 |
| 42 | 5727 |
| 43 | -3119 |
| 44 | 6121 |
| 45 | -7041 |
| 46 | 5642 |
| 47 | -13088 |
| 48 | 5097 |
| 49 | -20758 |
| 50 | 5879 |