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 | 65535 |
| 1 | 16711935 |
| 2 | 252645135 |
| 3 | 858993459 |
| 4 | 1431655765 |
| 5 | 2523490710 |
| 6 | 64425505596 |
| 7 | 219046689807 |
| 8 | 365122770518 |
| 9 | 644299577754 |
| 10 | 3311504066038 |
| 11 | 5570865221243 |
| 12 | 26401251330613 |
| 13 | 44053766282056 |
| 14 | 211127799335772 |