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 | 3 |
| 2 | 5 |
| 3 | 5 |
| 4 | 1 |
| 5 | -7 |
| 6 | -15 |
| 7 | -15 |
| 8 | 1 |
| 9 | 33 |
| 10 | 65 |
| 11 | 65 |
| 12 | 1 |
| 13 | -127 |
| 14 | -255 |
| 15 | -255 |
| 16 | 1 |
| 17 | 513 |
| 18 | 1025 |
| 19 | 1025 |
| 20 | 1 |
| 21 | -2047 |
| 22 | -4095 |
| 23 | -4095 |
| 24 | 1 |
| 25 | 8193 |
| 26 | 16385 |
| 27 | 16385 |
| 28 | 1 |
| 29 | -32767 |
| 30 | -65535 |
| 31 | -65535 |
| 32 | 1 |
| 33 | 131073 |
| 34 | 262145 |
| 35 | 262145 |
| 36 | 1 |
| 37 | -524287 |
| 38 | -1048575 |
| 39 | -1048575 |
| 40 | 1 |
| 41 | 2097153 |
| 42 | 4194305 |
| 43 | 4194305 |
| 44 | 1 |
| 45 | -8388607 |
| 46 | -16777215 |
| 47 | -16777215 |