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 | 5 |
| 1 | 33 |
| 2 | 257 |
| 3 | 2049 |
| 4 | 16385 |
| 5 | 131073 |
| 6 | 1048577 |
| 7 | 8388609 |
| 8 | 67108865 |
| 9 | 536870913 |
| 10 | 4294967297 |
| 11 | 34359738369 |
| 12 | 274877906945 |
| 13 | 2199023255553 |
| 14 | 17592186044417 |
| 15 | 140737488355329 |
| 16 | 1125899906842625 |
| 17 | 9007199254740993 |
| 18 | 72057594037927937 |