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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 21 |
| 6 | 31 |
| 7 | 45 |
| 8 | 63 |
| 9 | 93 |
| 10 | 105 |
| 11 | 127 |
| 12 | 189 |
| 13 | 217 |
| 14 | 255 |
| 15 | 315 |
| 16 | 341 |
| 17 | 455 |
| 18 | 511 |
| 19 | 819 |
| 20 | 1023 |
| 21 | 1365 |
| 22 | 2047 |
| 23 | 3591 |
| 24 | 3855 |
| 25 | 4095 |
| 26 | 5461 |
| 27 | 8191 |
| 28 | 12483 |
| 29 | 13107 |
| 30 | 16383 |
| 31 | 21845 |
| 32 | 29127 |
| 33 | 32767 |
| 34 | 53261 |
| 35 | 55831 |
| 36 | 60787 |
| 37 | 65535 |
| 38 | 87381 |
| 39 | 131071 |
| 40 | 178481 |
| 41 | 182361 |
| 42 | 209715 |
| 43 | 258111 |
| 44 | 262143 |
| 45 | 349525 |
| 46 | 430185 |
| 47 | 479349 |
| 48 | 524287 |