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 | 0 |
| 3 | -1 |
| 4 | -1 |
| 5 | -1 |
| 6 | -2 |
| 7 | -1 |
| 8 | -2 |
| 9 | -1 |
| 10 | -1 |
| 11 | 1 |
| 12 | -1 |
| 13 | 3 |
| 14 | 2 |
| 15 | 5 |
| 16 | 4 |
| 17 | 8 |
| 18 | 7 |
| 19 | 11 |
| 20 | 8 |
| 21 | 12 |
| 22 | 11 |
| 23 | 13 |
| 24 | 10 |
| 25 | 9 |
| 26 | 9 |
| 27 | 7 |
| 28 | 3 |
| 29 | -2 |
| 30 | -5 |
| 31 | -13 |
| 32 | -16 |
| 33 | -25 |
| 34 | -28 |
| 35 | -48 |
| 36 | -44 |
| 37 | -66 |
| 38 | -60 |
| 39 | -82 |
| 40 | -82 |
| 41 | -104 |
| 42 | -95 |
| 43 | -120 |
| 44 | -103 |
| 45 | -131 |
| 46 | -107 |
| 47 | -133 |
| 48 | -98 |
| 49 | -124 |
| 50 | -85 |
| 51 | -94 |
| 52 | -42 |
| 53 | -51 |
| 54 | 9 |
| 55 | 7 |
| 56 | 83 |
| 57 | 100 |
| 58 | 181 |
| 59 | 208 |
| 60 | 298 |