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 | 1 |
| 2 | -1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | -1 |
| 8 | -1 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 1 |
| 13 | 2 |
| 14 | 2 |
| 15 | 1 |
| 16 | 0 |
| 17 | -1 |
| 18 | -2 |
| 19 | -3 |
| 20 | -4 |
| 21 | -5 |
| 22 | -5 |
| 23 | -5 |
| 24 | -4 |
| 25 | -3 |
| 26 | -1 |
| 27 | 2 |
| 28 | 5 |
| 29 | 8 |
| 30 | 11 |
| 31 | 14 |
| 32 | 17 |
| 33 | 18 |
| 34 | 20 |
| 35 | 20 |
| 36 | 20 |
| 37 | 18 |
| 38 | 16 |
| 39 | 11 |
| 40 | 8 |
| 41 | 0 |
| 42 | -6 |
| 43 | -15 |
| 44 | -23 |
| 45 | -34 |
| 46 | -43 |
| 47 | -54 |
| 48 | -63 |
| 49 | -73 |
| 50 | -81 |
| 51 | -88 |
| 52 | -95 |
| 53 | -98 |
| 54 | -101 |
| 55 | -99 |
| 56 | -99 |
| 57 | -89 |
| 58 | -86 |
| 59 | -70 |
| 60 | -60 |
| 61 | -38 |
| 62 | -24 |
| 63 | 8 |
| 64 | 25 |
| 65 | 62 |