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 | 1 |
| 1 | 2047 |
| 2 | 2049 |
| 3 | 4196353 |
| 4 | 4194305 |
| 5 | 17600780175361 |
| 6 | 4192257 |
| 7 | 73823022692637345793 |
| 8 | 17592186044417 |
| 9 | 73786976303428141057 |
| 10 | 17583600302081 |
| 11 | 1298708349570020393652962442872833 |
| 12 | 17592181850113 |