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 | 5 |
| 2 | 7 |
| 3 | 11 |
| 4 | 19 |
| 5 | 67 |
| 6 | 131 |
| 7 | 4099 |
| 8 | 32771 |
| 9 | 65539 |
| 10 | 262147 |
| 11 | 268435459 |
| 12 | 1073741827 |
| 13 | 36028797018963971 |
| 14 | 147573952589676412931 |
| 15 | 19342813113834066795298819 |
| 16 | 431359146674410236714672241392314090778194310760649159697657763987459 |