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 | 63 |
| 6 | 65 |
| 7 | 195 |
| 8 | 325 |
| 9 | 341 |
| 10 | 4095 |
| 11 | 4097 |
| 12 | 4161 |
| 13 | 12291 |
| 14 | 12483 |
| 15 | 20485 |
| 16 | 20805 |
| 17 | 21525 |
| 18 | 21845 |
| 19 | 258111 |
| 20 | 262143 |
| 21 | 262145 |
| 22 | 266305 |
| 23 | 786435 |
| 24 | 798915 |
| 25 | 1310725 |
| 26 | 1311749 |
| 27 | 1331525 |
| 28 | 1332549 |
| 29 | 1376277 |
| 30 | 1377301 |
| 31 | 1397077 |
| 32 | 1398101 |
| 33 | 16515135 |
| 34 | 16777215 |
| 35 | 16777217 |
| 36 | 16781313 |