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 | -1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 0 |
| 6 | -1 |
| 7 | 2 |
| 8 | -1 |
| 9 | 2 |
| 10 | 0 |
| 11 | 3 |
| 12 | -4 |
| 13 | 5 |
| 14 | -1 |
| 15 | 1 |
| 16 | -3 |
| 17 | 0 |
| 18 | -1 |
| 19 | -4 |
| 20 | -1 |
| 21 | -2 |
| 22 | 3 |
| 23 | -12 |
| 24 | 6 |
| 25 | -14 |
| 26 | 15 |
| 27 | -8 |
| 28 | 17 |
| 29 | -16 |
| 30 | 25 |
| 31 | -18 |
| 32 | 23 |
| 33 | 0 |
| 34 | 5 |
| 35 | 4 |
| 36 | 15 |
| 37 | 3 |
| 38 | -12 |
| 39 | 29 |
| 40 | -29 |
| 41 | 41 |
| 42 | -59 |
| 43 | 54 |
| 44 | -56 |
| 45 | 5 |
| 46 | -89 |
| 47 | 68 |
| 48 | -110 |
| 49 | 84 |
| 50 | -137 |
| 51 | 55 |
| 52 | -52 |
| 53 | 55 |
| 54 | -95 |
| 55 | 104 |
| 56 | -53 |
| 57 | -9 |
| 58 | 47 |
| 59 | -11 |
| 60 | 109 |
| 61 | -25 |
| 62 | 157 |
| 63 | -139 |
| 64 | 278 |
| 65 | -144 |
| 66 | 455 |
| 67 | -359 |
| 68 | 413 |
| 69 | -289 |
| 70 | 554 |