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 | 0 |
| 4 | -2 |
| 5 | -5 |
| 6 | -8 |
| 7 | -9 |
| 8 | -5 |
| 9 | 7 |
| 10 | 28 |
| 11 | 54 |
| 12 | 73 |
| 13 | 64 |
| 14 | 1 |
| 15 | -135 |
| 16 | -335 |
| 17 | -536 |
| 18 | -602 |
| 19 | -333 |
| 20 | 472 |
| 21 | 1879 |
| 22 | 3619 |
| 23 | 4887 |
| 24 | 4276 |
| 25 | 46 |
| 26 | -9071 |
| 27 | -22464 |
| 28 | -35903 |
| 29 | -40271 |
| 30 | -22175 |
| 31 | 31824 |
| 32 | 126094 |
| 33 | 242539 |
| 34 | 327160 |
| 35 | 285687 |
| 36 | 1675 |
| 37 | -609497 |
| 38 | -1506356 |
| 39 | -2404890 |
| 40 | -2693927 |
| 41 | -1476608 |
| 42 | 2145601 |
| 43 | 8461737 |
| 44 | 16254481 |
| 45 | 21901624 |