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 | 3 |
| 2 | 7 |
| 3 | 13 |
| 4 | 23 |
| 5 | 41 |
| 6 | 271 |
| 7 | 2069 |
| 8 | 16411 |
| 9 | 32797 |
| 10 | 134217781 |
| 11 | 2199023255633 |
| 12 | 1125899906842723 |
| 13 | 2251799813685349 |
| 14 | 2596148429267413814265248164610269 |
| 15 | 11150372599265311570767859136324180752990493 |