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 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 1 |
| 7 | -5 |
| 8 | 7 |
| 9 | -1 |
| 10 | 1 |
| 11 | -7 |
| 12 | 17 |
| 13 | -15 |
| 14 | 1 |
| 15 | 1 |
| 16 | -9 |
| 17 | 31 |
| 18 | -49 |
| 19 | 31 |
| 20 | -1 |
| 21 | 1 |
| 22 | -11 |
| 23 | 49 |
| 24 | -111 |
| 25 | 129 |
| 26 | -63 |
| 27 | 1 |
| 28 | 1 |
| 29 | -13 |
| 30 | 71 |
| 31 | -209 |
| 32 | 351 |
| 33 | -321 |
| 34 | 127 |
| 35 | -1 |
| 36 | 1 |
| 37 | -15 |
| 38 | 97 |
| 39 | -351 |
| 40 | 769 |
| 41 | -1023 |
| 42 | 769 |
| 43 | -255 |
| 44 | 1 |
| 45 | 1 |
| 46 | -17 |
| 47 | 127 |
| 48 | -545 |
| 49 | 1471 |
| 50 | -2561 |
| 51 | 2815 |
| 52 | -1793 |
| 53 | 511 |
| 54 | -1 |
| 55 | 1 |
| 56 | -19 |
| 57 | 161 |
| 58 | -799 |
| 59 | 2561 |