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 | 0 |
| 2 | -1 |
| 3 | 1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 0 |
| 7 | 2 |
| 8 | 0 |
| 9 | -2 |
| 10 | 2 |
| 11 | 4 |
| 12 | -3 |
| 13 | -2 |
| 14 | 8 |
| 15 | 1 |
| 16 | -8 |
| 17 | 8 |
| 18 | 12 |
| 19 | -11 |
| 20 | -4 |
| 21 | 25 |
| 22 | 4 |
| 23 | -24 |
| 24 | 21 |
| 25 | 40 |
| 26 | -31 |
| 27 | -16 |
| 28 | 82 |
| 29 | 14 |
| 30 | -81 |
| 31 | 71 |
| 32 | 131 |
| 33 | -99 |
| 34 | -48 |
| 35 | 258 |
| 36 | 46 |
| 37 | -249 |
| 38 | 223 |
| 39 | 422 |
| 40 | -303 |
| 41 | -162 |
| 42 | 825 |
| 43 | 169 |
| 44 | -791 |
| 45 | 714 |
| 46 | 1360 |
| 47 | -955 |
| 48 | -503 |
| 49 | 2641 |
| 50 | 573 |
| 51 | -2479 |
| 52 | 2263 |
| 53 | 4365 |
| 54 | -2941 |
| 55 | -1592 |
| 56 | 8436 |
| 57 | 1978 |
| 58 | -7830 |
| 59 | 7212 |
| 60 | 14083 |
| 61 | -9133 |
| 62 | -4992 |
| 63 | 26970 |
| 64 | 6688 |
| 65 | -24590 |