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 | -2 |
| 3 | -1 |
| 4 | 0 |
| 5 | 9 |
| 6 | -1 |
| 7 | -3 |
| 8 | -2 |
| 9 | -2 |
| 10 | 36 |
| 11 | -22 |
| 12 | -40 |
| 13 | -34 |
| 14 | -23 |
| 15 | 154 |
| 16 | -53 |
| 17 | -89 |
| 18 | -48 |
| 19 | -4 |
| 20 | 652 |
| 21 | -161 |
| 22 | -352 |
| 23 | -293 |
| 24 | -213 |
| 25 | 1974 |
| 26 | -813 |
| 27 | -1416 |
| 28 | -1198 |
| 29 | -838 |
| 30 | 6386 |
| 31 | -2328 |
| 32 | -3970 |
| 33 | -3054 |
| 34 | -1682 |
| 35 | 20641 |
| 36 | -5637 |
| 37 | -10436 |
| 38 | -8183 |
| 39 | -4723 |
| 40 | 59693 |
| 41 | -17856 |
| 42 | -32830 |
| 43 | -28002 |
| 44 | -19303 |