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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | -1 |
| 7 | 7 |
| 8 | -3 |
| 9 | 9 |
| 10 | -5 |
| 11 | 15 |
| 12 | -11 |
| 13 | 23 |
| 14 | -17 |
| 15 | 25 |
| 16 | -17 |
| 17 | 33 |
| 18 | -27 |
| 19 | 45 |
| 20 | -37 |
| 21 | 49 |
| 22 | -39 |
| 23 | 61 |
| 24 | -53 |
| 25 | 73 |
| 26 | -61 |
| 27 | 79 |
| 28 | -67 |
| 29 | 95 |
| 30 | -87 |
| 31 | 117 |
| 32 | -101 |
| 33 | 121 |
| 34 | -105 |
| 35 | 129 |
| 36 | -117 |
| 37 | 153 |
| 38 | -135 |
| 39 | 159 |
| 40 | -143 |
| 41 | 183 |
| 42 | -171 |
| 43 | 213 |
| 44 | -193 |
| 45 | 217 |
| 46 | -195 |
| 47 | 241 |
| 48 | -225 |
| 49 | 267 |
| 50 | -247 |
| 51 | 279 |
| 52 | -255 |
| 53 | 307 |
| 54 | -289 |
| 55 | 329 |
| 56 | -305 |
| 57 | 341 |
| 58 | -313 |
| 59 | 371 |
| 60 | -355 |
| 61 | 415 |
| 62 | -385 |
| 63 | 421 |
| 64 | -389 |
| 65 | 437 |
| 66 | -417 |