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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 1 |
| 7 | -7 |
| 8 | 1 |
| 9 | 1 |
| 10 | -15 |
| 11 | 5 |
| 12 | 1 |
| 13 | -31 |
| 14 | 17 |
| 15 | -1 |
| 16 | 1 |
| 17 | -63 |
| 18 | 49 |
| 19 | -7 |
| 20 | 1 |
| 21 | -127 |
| 22 | 129 |
| 23 | -31 |
| 24 | 1 |
| 25 | 1 |
| 26 | -255 |
| 27 | 321 |
| 28 | -111 |
| 29 | 9 |
| 30 | 1 |
| 31 | -511 |
| 32 | 769 |
| 33 | -351 |
| 34 | 49 |
| 35 | -1 |
| 36 | 1 |
| 37 | -1023 |
| 38 | 1793 |
| 39 | -1023 |
| 40 | 209 |
| 41 | -11 |
| 42 | 1 |
| 43 | -2047 |
| 44 | 4097 |
| 45 | -2815 |
| 46 | 769 |
| 47 | -71 |
| 48 | 1 |
| 49 | 1 |
| 50 | -4095 |
| 51 | 9217 |
| 52 | -7423 |
| 53 | 2561 |
| 54 | -351 |
| 55 | 13 |
| 56 | 1 |
| 57 | -8191 |
| 58 | 20481 |
| 59 | -18943 |
| 60 | 7937 |
| 61 | -1471 |
| 62 | 97 |
| 63 | -1 |