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 | 1 |
| 3 | 3 |
| 4 | -3 |
| 5 | 1 |
| 6 | -5 |
| 7 | 9 |
| 8 | -5 |
| 9 | 1 |
| 10 | 11 |
| 11 | -23 |
| 12 | 19 |
| 13 | -7 |
| 14 | 1 |
| 15 | -21 |
| 16 | 57 |
| 17 | -61 |
| 18 | 33 |
| 19 | -9 |
| 20 | 1 |
| 21 | 43 |
| 22 | -135 |
| 23 | 179 |
| 24 | -127 |
| 25 | 51 |
| 26 | -11 |
| 27 | 1 |
| 28 | -85 |
| 29 | 313 |
| 30 | -493 |
| 31 | 433 |
| 32 | -229 |
| 33 | 73 |
| 34 | -13 |
| 35 | 1 |
| 36 | 171 |
| 37 | -711 |
| 38 | 1299 |
| 39 | -1359 |
| 40 | 891 |
| 41 | -375 |
| 42 | 99 |
| 43 | -15 |
| 44 | 1 |
| 45 | -341 |
| 46 | 1593 |
| 47 | -3309 |
| 48 | 4017 |
| 49 | -3141 |
| 50 | 1641 |
| 51 | -573 |
| 52 | 129 |
| 53 | -17 |
| 54 | 1 |
| 55 | 683 |
| 56 | -3527 |
| 57 | 8211 |
| 58 | -11343 |
| 59 | 10299 |
| 60 | -6423 |
| 61 | 2787 |
| 62 | -831 |
| 63 | 163 |
| 64 | -19 |
| 65 | 1 |