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 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | -2 |
| 7 | 2 |
| 8 | 2 |
| 9 | -1 |
| 10 | -7 |
| 11 | 5 |
| 12 | 8 |
| 13 | -4 |
| 14 | -22 |
| 15 | 23 |
| 16 | 30 |
| 17 | -32 |
| 18 | -101 |
| 19 | 102 |
| 20 | 160 |
| 21 | -81 |
| 22 | -434 |
| 23 | 288 |
| 24 | 515 |
| 25 | -249 |
| 26 | -1393 |
| 27 | 1542 |
| 28 | 1756 |
| 29 | -1950 |
| 30 | -6694 |
| 31 | 7040 |
| 32 | 10192 |
| 33 | -4724 |
| 34 | -29594 |
| 35 | 18851 |
| 36 | 30282 |
| 37 | -9298 |
| 38 | -89627 |
| 39 | 106068 |
| 40 | 97255 |
| 41 | -127909 |
| 42 | -453650 |
| 43 | 498939 |
| 44 | 641627 |
| 45 | -207845 |
| 46 | -2026461 |