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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 1 |
| 5 | 0 |
| 6 | 5 |
| 7 | 6 |
| 8 | 1 |
| 9 | 0 |
| 10 | 9 |
| 11 | 0 |
| 12 | 11 |
| 13 | 12 |
| 14 | 1 |
| 15 | 0 |
| 16 | 15 |
| 17 | 0 |
| 18 | 17 |
| 19 | 0 |
| 20 | -1 |
| 21 | 20 |
| 22 | -1 |
| 23 | -2 |
| 24 | 23 |
| 25 | 24 |
| 26 | 25 |
| 27 | 0 |
| 28 | -1 |
| 29 | 28 |
| 30 | 29 |
| 31 | 0 |
| 32 | -1 |
| 33 | 32 |
| 34 | -1 |
| 35 | 34 |
| 36 | -1 |
| 37 | 36 |
| 38 | -1 |
| 39 | -2 |
| 40 | 39 |
| 41 | -2 |
| 42 | 41 |
| 43 | -2 |
| 44 | 43 |
| 45 | 44 |
| 46 | -1 |
| 47 | -2 |
| 48 | -3 |
| 49 | -4 |
| 50 | 49 |
| 51 | 50 |
| 52 | -3 |
| 53 | 52 |
| 54 | -3 |
| 55 | 54 |
| 56 | -3 |
| 57 | 56 |
| 58 | -3 |
| 59 | 58 |
| 60 | 59 |
| 61 | -2 |
| 62 | 61 |
| 63 | -2 |
| 64 | -3 |
| 65 | 64 |
| 66 | 65 |
| 67 | -2 |
| 68 | 67 |
| 69 | -2 |
| 70 | 69 |
| 71 | 70 |
| 72 | -1 |
| 73 | -2 |