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 | 15 |
| 6 | 17 |
| 7 | 51 |
| 8 | 85 |
| 9 | 255 |
| 10 | 257 |
| 11 | 273 |
| 12 | 771 |
| 13 | 819 |
| 14 | 1285 |
| 15 | 1365 |
| 16 | 3855 |
| 17 | 4095 |
| 18 | 4097 |
| 19 | 4369 |
| 20 | 12291 |
| 21 | 13107 |
| 22 | 20485 |
| 23 | 21845 |
| 24 | 61455 |
| 25 | 65535 |
| 26 | 65537 |
| 27 | 65793 |
| 28 | 69649 |
| 29 | 69905 |
| 30 | 196611 |
| 31 | 197379 |
| 32 | 208947 |
| 33 | 209715 |
| 34 | 327685 |
| 35 | 328965 |
| 36 | 348245 |
| 37 | 349525 |
| 38 | 983055 |
| 39 | 986895 |
| 40 | 1044735 |
| 41 | 1048575 |