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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | -2 |
| 7 | -5 |
| 8 | -9 |
| 9 | -13 |
| 10 | -15 |
| 11 | -12 |
| 12 | 0 |
| 13 | 25 |
| 14 | 65 |
| 15 | 117 |
| 16 | 169 |
| 17 | 196 |
| 18 | 158 |
| 19 | 3 |
| 20 | -321 |
| 21 | -841 |
| 22 | -1519 |
| 23 | -2200 |
| 24 | -2560 |
| 25 | -2079 |
| 26 | -79 |
| 27 | 4121 |
| 28 | 10881 |
| 29 | 19720 |
| 30 | 28638 |
| 31 | 33435 |
| 32 | 27351 |
| 33 | 1547 |
| 34 | -52895 |
| 35 | -140772 |
| 36 | -256000 |
| 37 | -372775 |
| 38 | -436655 |
| 39 | -359763 |
| 40 | -26871 |