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 | 0 |
| 1 | -1 |
| 2 | 0 |
| 3 | 3 |
| 4 | -2 |
| 5 | -3 |
| 6 | 0 |
| 7 | 1 |
| 8 | 4 |
| 9 | -1 |
| 10 | -2 |
| 11 | 5 |
| 12 | 4 |
| 13 | -1 |
| 14 | -2 |
| 15 | -7 |
| 16 | -2 |
| 17 | 3 |
| 18 | -2 |
| 19 | -13 |
| 20 | -12 |
| 21 | -9 |
| 22 | -20 |
| 23 | -19 |
| 24 | -22 |
| 25 | -19 |
| 26 | -18 |
| 27 | -15 |
| 28 | -20 |
| 29 | -21 |
| 30 | -14 |
| 31 | -15 |
| 32 | -20 |
| 33 | -21 |
| 34 | -26 |
| 35 | -21 |
| 36 | -16 |
| 37 | -21 |
| 38 | -32 |
| 39 | -31 |
| 40 | -28 |
| 41 | -49 |
| 42 | -48 |
| 43 | -51 |
| 44 | -54 |
| 45 | -45 |
| 46 | -44 |
| 47 | -45 |
| 48 | -50 |
| 49 | -51 |
| 50 | -56 |
| 51 | -51 |
| 52 | -46 |
| 53 | -51 |
| 54 | -62 |
| 55 | -61 |
| 56 | -58 |
| 57 | -79 |