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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 15 |
| 7 | 27 |
| 8 | 31 |
| 9 | 45 |
| 10 | 63 |
| 11 | 85 |
| 12 | 93 |
| 13 | 119 |
| 14 | 127 |
| 15 | 255 |
| 16 | 495 |
| 17 | 511 |
| 18 | 891 |
| 19 | 1023 |
| 20 | 1755 |
| 21 | 1787 |
| 22 | 2015 |
| 23 | 2047 |
| 24 | 2925 |
| 25 | 4095 |
| 26 | 5805 |
| 27 | 5869 |
| 28 | 8127 |
| 29 | 8191 |
| 30 | 10965 |
| 31 | 11997 |
| 32 | 15351 |
| 33 | 16383 |
| 34 | 21845 |
| 35 | 21973 |
| 36 | 23901 |
| 37 | 24029 |
| 38 | 30583 |
| 39 | 30711 |
| 40 | 32639 |
| 41 | 32767 |
| 42 | 65535 |
| 43 | 130815 |
| 44 | 131071 |
| 45 | 253935 |