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 | 1 |
| 5 | -1 |
| 6 | 1 |
| 7 | -1 |
| 8 | 2 |
| 9 | -2 |
| 10 | 2 |
| 11 | -2 |
| 12 | 3 |
| 13 | -3 |
| 14 | 3 |
| 15 | -4 |
| 16 | 5 |
| 17 | -5 |
| 18 | 5 |
| 19 | -6 |
| 20 | 7 |
| 21 | -8 |
| 22 | 8 |
| 23 | -9 |
| 24 | 11 |
| 25 | -12 |
| 26 | 12 |
| 27 | -14 |
| 28 | 16 |
| 29 | -17 |
| 30 | 18 |
| 31 | -20 |
| 32 | 23 |
| 33 | -25 |
| 34 | 26 |
| 35 | -29 |
| 36 | 33 |
| 37 | -35 |
| 38 | 37 |
| 39 | -41 |
| 40 | 46 |
| 41 | -49 |
| 42 | 52 |
| 43 | -57 |
| 44 | 63 |
| 45 | -68 |
| 46 | 72 |
| 47 | -78 |
| 48 | 87 |
| 49 | -93 |
| 50 | 98 |
| 51 | -107 |
| 52 | 117 |
| 53 | -125 |
| 54 | 133 |
| 55 | -144 |
| 56 | 157 |
| 57 | -168 |
| 58 | 178 |
| 59 | -192 |
| 60 | 209 |
| 61 | -223 |
| 62 | 236 |
| 63 | -255 |
| 64 | 276 |
| 65 | -294 |
| 66 | 312 |
| 67 | -335 |
| 68 | 361 |
| 69 | -385 |